The main feature request is to provide the user with additional information regarding the transaction to be sent.

One first feature would be to provide the user with date/time info corresponding to the transaction prompt in metamask. The time could be passed when the web3js send() function is called. This can be important, when for example, I press some button and then leave the computer. Later on, I might not anymore know, what kind of transaction is shown in my metamask or whether it is recent.
Especially, when I accidentally click twice on a button or trigger multiple transaction, I might not know, which is which, or if they are duplicates.

Another feature would be, to show on which url/domain or button the prompt was triggered.
What I usually do, when I don't remember, is to reject all transactions and redo everything.