It would be nice for the forum software to have a link in the "topics" view (the place where you look at the titles of all the threads) that would take you to your latest reply. Almost everytime I open a thread I go straight to my last reply, so it would save beaucoup de time.
PS. I know you didn't make the forum software, but perhaps you can request a feature or something.
If the topic is longer than one side, there is already a link to the last page of it. (Albeit that one really could be larger, admitted) Otherwise it's just a matter of pressing "page down" repeatedly.
Maybe I did misunderstand you?
anytime I find myself repeatedly doing something (pressing page down) I think to myself, "This software could be doing more."
Vanilla does this by default. Click a thread, and move to your latest post on the correct page.