YOLF he came in causing trouble before violating the few rules the game has, he's not here to play and after Kaiza asked him to leave he really shouldn't be here.
He was making a legitimate suggestion, though, and he wasn't being offensive or doing anything that appeared to be an attack. As the others have said, you can deny him the right to play in the game, but that doesn't automatically give you the right to stop him posting altogether. Personally, I will look on anything he posts in this thread with great suspicion, but that doesn't automatically mean anything he does is trolling.
as for his suggestion, as GM I say no, a program can be manipulated to generate any number and I'm already doing 90% of the rolling for various duties as GM using my dice is far faster, the results more accurate as is the idea of simply taking over the rest of the rolling. My rolling everything is immaterial because the basic requirements of the game are civility and trust
Well, if you're rolling anyway, then whether the program can be manipulated is irrelevant. Because the only person doing the manipulation in that case would be you, and you can also manipulate dice. But, yes, regardless, it is entirely your decision, and if someone doesn't trust you to roll the dice fairly then they shouldn't be playing in the first place.