My server could really use a plugin to combat throw hacks, which sadly NoCheat can not stop. I have tried adding snowball to the WorldGuard blacklist for the creative mode world.... however, griefers have still managed to throw hack them and nearly crash the server.
This is easy. Install either nocheat or knohax and configure them to automatically kick players after a violationlevel of about 15. You could also change your worldguard setting to kick instead of disable for a quick fix.