i was more concerned about game server, even if minimal its still cpu/network overhead and if server starts with huge online it might have impact,
also how fast will this tool block spammers? because as you said it doesn't include delays on msg sending, so i could easily build list of nicks from towns, save it up, and then send 3k PMs in bunches from 5 characters at same time, without delays it will take like 1 minute and once msg is sent it won't matter when ban will come :D