Can you add this function?

Well, if you decide to implement that feature,
it would be good to also have an option to jump to the last previously viewed post i.e. not to the first unread but to the last read.
That would allow the user to refresh the memory and to get some context before reading a new post.

Hi @abooster, and thanks for the suggestions.
It is now implemented in v1.2.7.
Donate if you like it !

Awesome! Thanks a lot!
I think that in bbppu-forum-marks.php
this: <span id="bbppu-mark-as-read"> should be in a div to be able to move it around more easily.
For my theme I modified it to:
<div id="bbppu-mark-as-read" style="text-align:right;"> for now.

I also replaced dashicons-flag with dashicons-format-status and changed ‘Go to bookmark’ to ‘Jump to last read post!’ but that’s just my personal preference.

I’ll do a donation once I launch my site (which should be soon).