Hey, I have an idea for the creator of a server, why not make it so they can bring up a panel that will have certain options on it, and it could be IP based, these options could include: 

Muting/Banning a player from their server.

Kicking a player off their server with a warning message.

Sending a player an on screen message.

Giving players certain rights to the server such as kicking (no banning) and muting for set periods of time.

Giving/Revoking building rights.

Maybe even add mob spawning and allow them to enable survival features :P

If you like this idea I could try think up some new stuff for it. (I know it's a weird idea, but I'm weird myself :P)