i noticed just how many posts there are everyday that just say "my threads", "threads" or a variation of the sort. why not just create a button that would add a certain thread into your "my threads" list. it would slow ridiculous post counts and would make reading threads alot more enjoyable not having to read over numerous posts saying "my threads!!!!"
i realize this button wouldnt allow popular threads to stay on the top of the forum as people wouldnt be posting in them but perhaps you could work on another forum of the "most favorited" or "most saved to my threads" forum. not really sure about that one, just a suggestion for the site.
peace dudes