At first I was impartial to this, but I like the idea if we use Fireaux's idea in it, because I do think that some people would abuse it and I'm to lazy to waste my time filling out a report. ;c
I would also like to add that by "bumping" the "unread" icon to the side of the thread shouldn't be marked. Like, if someone is bumping a thread that you've already read, it should still have the grey "read" symbol, and not have the flashing "unread" symbol. I think some attention-starved users would take advantage of the bump button like that and I don't want to have to memorize all the post counts on everything to see if there's really a new post on something.