Board Pause
Okay, thought about this one last night, think it's pretty good.
So, last night, some spambot created 17 threads advertising some website in support (the threads are now deleted and the bot is banned).
Anyway, I think it would be helpful for admins of boards (For instance, the admins of this board are Lazors, HolyButler, 2WC, Cheshyre, Butler153) to have a sort of 'pause' button for their board.
If some user is spamming really hard or something, then an admin can pause the board, preventing new threads from being created until the board is unpaused.
If a spambot does something like create a bunch of spam threads, then they can be stopped with a simple board pause. While the board is paused, the admin can ban the user and delete the threads.
This would also be useful in clan boards; if the admin notices some sort of fight going on between members of a clan, they can pause the board to prevent meaningless arguments cluttering their thread.
Anyway, just an idea for preventing spambots doing what they do best.