I think it might be better for the forums to show all threads from the start instead of just the last 100 days.
Compair these two URLs.
http://affiliate-marketing-forums.5s...splay.php?f=36
http://affiliate-marketing-forums.5s...c&daysprune=-1
I'm guessing you can't really 'bump' threads yet. This would give every one more threads to look at and reply to.
SEO wise, the Googlebot would see more threads to crawl and index.
