You can disable #kill, #summon, etc. This will prevent users from using #kill, #summon, etc.

However, if you are a status 80 user (or above), there is another way to execute these commands: /kill, /summon, /lastname, etc. It drove me nuts on my server, where people were status 80 by default. No matter how hard I tried to restrict the # commands, people were still exhibiting the behavior. Someone finally squealed that the '/' commands are not the same as the '#' commands. Changed default status to 20, and it hasn't been a problem since.

Hardcode a nice 200 in there. This problem has been driving me mad for a couple of months now. Everytime I think its fixed, he still manages to do it somehow.


EDIT:
My default status has been set to 20 since you last suggested it. And yes I did update the status of my entire accounts table to.