yeah, seriously, that dude is sick, u should ban that guys IP. Do not ban their IP if they have done something minimal, but something as serious as wat Hoad did, his IP should be banned.
There's not much you can do to get rid of people like him. He'll eventually connect through a proxy server, therefore banning every proxy address is unacceptable because there are alot of legit one and isn't a good idea if TF wants to grow.
Range IP ban is out of order for other people on his IP range. Best thing would be a small bit of software which would 'parental control' this site. Single IP would not work, as he will most likely have a dynamic.