Nice Hack
What i'd like to see:
Users can still reply, but if the Thread is expired they will see a Warning (Maybe an Image and some blah blah Text saying that the Thread is pretty old) and have to tick a Checkbox that they are aware of this but still feel that it's necessary to answer.
That's because sometimes it does make sense to bump an old Thread, but in most cases it does not make sense and the Users just don't realize how old the Thread is.
Btw: Moved to Plugins