"Very often", how you can know ? I'm using F12 and others keys for different purposes and I won't be able to play on your server just because you "think" it's often used. You don't know, and since you don't know you should not assume people is cheating because they use such key. Really doesn't make sense. Also slowhacking is not allowed. You will modify people's bind without knowing. You won't stop cheat with that at all. Wake up.