I know on other forums I have been on, I have seen a bump button to bump the thread to the top. This is helpful because it limits spamming the forums, and I believe that you can set a time limit on bumping the threads. Here is a link of a modification (I believe this is what I am talking about, although Im not 100% sure if it is the exact same) http://xenforo.com/community/resources/bump-a-thread.446/
