Pinging @poire-z and @Frenzie and @offset-torque (anyone else?)
Since there appears to be only a single touch-based quick start guide available to all KOReader users, I took the liberty of making some adjustments to the guide to make it useful for NT Kindle users (not my best work though ;))
Since I am not entirely sure how to handle documentation, I am uploading it here for your consideration.
Quickstart guide k4
local quickstart_guide_kindle4 = T(_([[
<div class="logo"></div>
# Quickstart guide
* [User interface](#ui)
* [User interface tips](#uitips)
* [Accessing files](#afiles)
* [Transferring files](#tfiles)
* [Shortcuts](#short)
* [While reading](#reading)
* [Installing dictionaries](#dicts)
* [More info](#more)
---
You can access the complete user manual from [our GitHub page](https://github.com/koreader/koreader).
]])
..
_([[## User interface <a id="ui"></a>
<div class="img-block"></div>
- To show the **TOP MENU** or **BOTTOM MENU** press the **Menu** or **Press** keys respectively.
- The **STATUS BAR** can be set to show a multitude of information regarding your reading progress or device state.
]])
..
_([[## User interface tips <a id="uitips"></a>
- You can change the interface language using:
> **Menu ➔  ➔ Language**
- If you press both **ScreenKB** + **Press** on an option or menu item (font weight, line spacing etc.), you can set its value as **DEFAULT**. The new value will only be applied to documents opened from now on. Previously opened documents will keep their settings. You can identify default values as a STAR in menu or as a black border around indicators as seen below:
<div class="img-block break-before-avoid"></div>
<div class="img-block break-before-avoid"></div>
- You can see explanations for some items on the **TOP MENU** by pressing both **ScreenKB** + **Press** on the name of the option.
- You can **CLOSE** full screen dialogs (History, Table of Contents, Bookmarks, Reading Statistics etc.) by pressing the **Back** key.
- **SCREENSHOTS** can be taken by pressing the **ScreenKB** + **Menu** keys
<div class="img-block break-after-avoid"></div>
- In dialogs containing adjustment arrow buttons like the one above, you can use the directional keys to move around. If widgets have menus, pressing the **Menu** key should open them.
- You can toggle content selection mode by pressing either the **Up** or **Down** keys. The selection tool becomes available so you can select one or multiple words, for either dictionary, wikipedia or text look ups.
- You can highlight blocks of text by selecting multiple words with the content selection tool.
- You can move through your document with the **Left** or **Right** cursor keys which, should take you to the previous or next chapter respectively.
- The content selection tool's sensitivity can be adjusted in the **TOP MENU**.
> **Menu ➔  ➔ Selection on text**
]])
..
_([[## Accessing files <a id="afiles"></a>
The following methods are available for accessing your books and articles:
* File Browser
* Favorites
* History
You can also set KOReader to open with any of these dialogs on startup via:
> **Menu (in File Browser) ➔  ➔ Start with**
]])
..
_([[## Transferring files <a id="tfiles"></a>
In addition to transferring files the same way you would with the built-in reader application, other options are available depending on your device:
1. USB Mass Storage mode within KOReader
2. Cloud storage (Dropbox/FTP/Webdav)
3. SSH/SFTP access
4. Calibre transfer
5. News downloader
6. Wallabag
]])
..
_([[## Shortcuts <a id="short"></a>
The following is a non-exhaustive list of shortcuts available.
When inside the reading module:
- **ScreenKB** + **Up**: Table of contents
- **ScreenKB** + **Right**: Add a bookmark
- **ScreenKB** + **Down**: Book map
- **ScreenKB** + **Left**: Bookmarks, notes and highlights
- **ScreenKB** + **Press**: Save current page to location history
- **ScreenKB** + **Home**: Toggle wifi on/off
- **ScreenKB** + **Back**: Switch to previosly opened book
When using a virtual keyboard:
- **ScreenKB** + **Right**: Move cursor to right char
- **ScreenKB** + **Left**: Move cursor to left char
- **ScreenKB** + **Press**: Show special characters behind virtual keyboard keys
- **ScreenKB** + **Home**: Toggle virtual keyboard on/off
- **ScreenKB** + **Back**: Delete char
]])
..
_([[## While reading <a id="reading"></a>
<div class="table"><div>
You can change the font
**Menu ➔  ➔ Font**
</div><div>
Make font bigger
**Press ➔ **
</div><div>
Make font bolder
**Press ➔ **
</div><div>
Invert the colors (white text on black)
**Menu ➔  ➔ Night mode**
</div><div>
Change many formatting options
**Menu ➔  ➔ Style tweaks**
</div></div>
]])
..
_([[## Installing dictionaries <a id="dicts"></a>
KOReader supports dictionary lookup in EPUB and even in scanned PDF/DJVU documents. To see the dictionary definition or translation, tap and hold a word.
To use the dictionary lookup function, first you need to install one or more dictionaries in the StarDict format. KOReader has an inbuilt dictionary installation system:
**Menu ➔  ➔ Dictionary Settings > Download dictionaries**
]])
..
_([[## More info <a id="more"></a>
You can find more information on our GitHub page
[https://github.com/koreader/koreader](https://github.com/koreader/koreader)
You can find other KOReader users on MobileRead forums
[https://www.mobileread.com/forums/forumdisplay.php?f=276](https://www.mobileread.com/forums/forumdisplay.php?f=276)
---
<div class="generated">Generated by KOReader %1.</div>
]]),
rev)
Quickstart guide legacy
local quickstart_guide_kindle_legacy = T(_([[
<div class="logo"></div>
# Quickstart guide
* [User interface](#ui)
* [User interface tips](#uitips)
* [Accessing files](#afiles)
* [Transferring files](#tfiles)
* [Shortcuts](#short)
* [While reading](#reading)
* [Installing dictionaries](#dicts)
* [More info](#more)
---
You can access the complete user manual from [our GitHub page](https://github.com/koreader/koreader).
]])
..
_([[## User interface <a id="ui"></a>
<div class="img-block"></div>
- To show the **TOP MENU** or **BOTTOM MENU** press the **Menu** or **AA** keys respectively.
- The **STATUS BAR** can be set to show a multitude of information regarding your reading progress or device state.
]])
..
_([[## User interface tips <a id="uitips"></a>
- You can change the interface language using:
> **Menu ➔  ➔ Language**
- If you press both **ScreenKB** + **Press** on an option or menu item (font weight, line spacing etc.), you can set its value as **DEFAULT**. The new value will only be applied to documents opened from now on. Previously opened documents will keep their settings. You can identify default values as a STAR in menu or as a black border around indicators as seen below:
<div class="img-block break-before-avoid"></div>
<div class="img-block break-before-avoid"></div>
- You can see explanations for some items on the **TOP MENU** by pressing both **Shift** + **Press** on the name of the option.
- You can **CLOSE** full screen dialogs (History, Table of Contents, Bookmarks, Reading Statistics etc.) by pressing the **Back** key.
- **SCREENSHOTS** can be taken by pressing the **Alt** + **Shift** + **G** keys
<div class="img-block break-after-avoid"></div>
- In dialogs containing adjustment arrow buttons like the one above, you can use the directional keys to move around. If widgets have menus, pressing the **Menu** key should open them.
- You can toggle content selection mode by pressing either the **Up** or **Down** keys. The selection tool becomes available so you can select one or multiple words, for either dictionary, wikipedia or text look ups.
- You can highlight blocks of text by selecting multiple words with the content selection tool.
- You can move through your document with the **Left** or **Right** cursor keys which, should take you to the previous or next chapter respectively.
- The content selection tool's sensitivity can be adjusted in the **TOP MENU**.
> **Menu ➔  ➔ Selection on text**
]])
..
_([[## Accessing files <a id="afiles"></a>
The following methods are available for accessing your books and articles:
* File Browser
* Favorites
* History
You can also set KOReader to open with any of these dialogs on startup via:
> **Menu (in File Browser) ➔  ➔ Start with**
]])
..
_([[## Transferring files <a id="tfiles"></a>
In addition to transferring files the same way you would with the built-in reader application, other options are available depending on your device:
1. USB Mass Storage mode within KOReader
2. Cloud storage (Dropbox/FTP/Webdav)
3. SSH/SFTP access
4. Calibre transfer
5. News downloader
6. Wallabag
]])
..
_([[## Shortcuts <a id="short"></a>
The following is a non-exhaustive list of shortcuts available.
When inside the reading module:
- **T**: Table of contents
- **Shift** + **Right**: Add a bookmark
- **Shift** + **Down**: Book map
- **B**: Bookmarks, notes and highlights
- **Shift** + **Press**: Save current page to location history
- **Shift** + **Home**: Toggle wifi on/off
- **Shift** + **Back**: Switch to previosly opened book
When using a virtual keyboard:
- **Shift** + **Right**: Move cursor to right char
- **Shift** + **Left**: Move cursor to left char
- **Shift** + **Press**: Show special characters behind virtual keyboard keys
- **Shift** + **Home**: Toggle virtual keyboard on/off
- **Shift** + **Del**: Delete word
- **Shift** + **Back**: Delete whole line
- **Sym** + **Alphabet keys**: symbols, numbers and special characters
]])
..
_([[## While reading <a id="reading"></a>
<div class="table"><div>
You can change the font
**Menu ➔  ➔ Font**
</div><div>
Make font bigger
**Press ➔ **
</div><div>
Make font bolder
**Press ➔ **
</div><div>
Invert the colors (white text on black)
**Menu ➔  ➔ Night mode**
</div><div>
Change many formatting options
**Menu ➔  ➔ Style tweaks**
</div></div>
]])
..
_([[## Installing dictionaries <a id="dicts"></a>
KOReader supports dictionary lookup in EPUB and even in scanned PDF/DJVU documents. To see the dictionary definition or translation, tap and hold a word.
To use the dictionary lookup function, first you need to install one or more dictionaries in the StarDict format. KOReader has an inbuilt dictionary installation system:
**Menu ➔  ➔ Dictionary Settings > Download dictionaries**
]])
..
_([[## More info <a id="more"></a>
You can find more information on our GitHub page
[https://github.com/koreader/koreader](https://github.com/koreader/koreader)
You can find other KOReader users on MobileRead forums
[https://www.mobileread.com/forums/forumdisplay.php?f=276](https://www.mobileread.com/forums/forumdisplay.php?f=276)
---
<div class="generated">Generated by KOReader %1.</div>
]]),
rev)
Now, these graphics were taken from Amazon's own user guides so not sure if we can use them but here they are nonetheless.

Pinging @poire-z and @Frenzie and @offset-torque (anyone else?)
Since there appears to be only a single touch-based quick start guide available to all KOReader users, I took the liberty of making some adjustments to the guide to make it useful for NT Kindle users (not my best work though ;))
Since I am not entirely sure how to handle documentation, I am uploading it here for your consideration.
Quickstart guide k4
Quickstart guide legacy
Now, these graphics were taken from Amazon's own user guides so not sure if we can use them but here they are nonetheless.