forums.smartfoxserver.com

There should be an option on the ban manager to manually add IPs. I actually have a system of my own to ban IP's, but I really wish I could use the more robust ban system from SFS. Problem is its almost impossible to handle them since you have to catch the abuser before he logs out :/

You can do it from server side, so you could build your custom banning/kick interface pretty easily.
Check the banUser() and kickUser methods