Does your feature request involve difficulty completing a task? Please describe.

Many books have reference pages in the back matter that I regularly jump to, but that are not hyperlinked to the main text. At the moment I use a combination of Book map, bookmarks, 'go to last bookmark' gesture, and 'go back to previous location'/ 'go forward to next location' to switch forth and back between the main text and the reference pages. All of these methods have some shortcomings (book map requires the intermediate step of opening the book map, bookmarks have to be removed and readded at the next location (and this method only works if it's actually the last bookmark in the book), go back/forward is not always working as expected).

Describe the solution you'd like

A temporary bookmark, tentatively called 'Reference point', for one page in the book, that can be moved at will; and two new actions for Dispatcher:

• Set Reference point
• Go to Reference point

(Setting a new Reference point will replace the previous one in the same book.)

Describe alternatives you've considered
n/a

Additional context
n/a