Everytime I try to check my previous post in a thread that had 400 pages, it's hard. The pages keeps increasing and I can't find my post (usually).

I'm suggesting for a "view your most recent post" button next to each topic you posted for.

For example you clicked "View your last post" then it usually shows a list of topics you've posted on, and next to each topic title would be "Go to post" (:

You can click or go to your 'profile' and it has the option of viewing your posts from recent to oldest. ^^ It includes the thread and your post and the forum and whatnot. ^^

It's not per thread, but it shows your last posts. [:

You can go to your post by going to your profile, checking your post and clicking the link next to Subject:

^^ i hope that helps, otherwise i think i misread what you were talking about xD;