Hmmm, I think it's a bad idea to close down that big subnets. That will leave too many players unable to connect. I think we can risk not closing the subnet until the cheater shows up 2 - 3 times again and if he does, THEN close down the subnet.
As for the Demos - I'm sorry but if he comes back here claiming that he was not aimbotting, that would be so ridiculous we don't have to argue with him. I mean, if it was a war-server, ok, right, for sure, record a demo, but the players here all play for fun and if he wants to argue with us, fine. Let him play again, we spectate him and done.
I neither have the nerves nor the time to always record a demo if it's such an obvious cheater. They don't deserve proper treatment and they don't deserve me wasting my time, really.