Eh, I don't think Will cheats. He aims just like Mr. Gauntlet on Nightmare, and I've played and beaten both (that is, Mr. Gauntlet on Nightmare w/rail-only cfg AND Willyopticus, they're both beatable)... if Will cheats it's a pretty quick toggle on/off of autofire, because his low sens movement has always been evident... and he has an uncanny ability to know exactly where the enemy spawns all the time. He has a killer sound system (seen pics) and doesn't play with headphones much.

His English is rather limited though, so it would be hard for him to defend himself well

willy is cool and doesnt cheat, he enjoys the challenge of the game far too much, hes been playing since the beginning of q3 and has a great hardware set up.. you should come and play ctf with him, you will see the secret to his success right there.
just cause someone is better than you, doesnt mean they cheat..
if you dont know how they play that good ask them. im sure someone like willy who takes great pleasure in beating people will share their knowledge with you.
his failing is when he does get beaten he blames his equipment instead of congratulating the winner at playing well.