No bump option on forum posts
When posting to a thread there are a number of options at the bottom of the screen. It would be good if there was one where your post is going to be added to the thread but you don't want it bumped to the top.
This would be useful in cases where you want to add some info that would be helpful to the OP (and you are comfortable they will find it when they follow up on their own post) but you don't think what you added warrants spamming it back up to the top of the first page
Example - You see a thread on something that has been suggested a hundred times but rather than snarking at the guy for it (because search is so bad not all these guys are to be blamed) you just want to add a couple links to the other threads to help him get caught up. But since its been suggested a hundred times and this post has already done its time on the front page you don't think it needs to go back there again.