I can attest to that SG Player cheating in RAWHIDE. I was climbing out of the floor on one level and he started shooting the edge before I even got there, and killed me by headshot... all from across the map hiding. I was ok with playing with him just for the competition (it was satisfying to kill him after all), but it got rather frustrating! I guess if he'd bothered to change his name from default though I would have just thought he was good, but any skilled gunslinger would have changed his name by now, you know?
Didn't think to contact you guys over the IRC. I'll do that if I see him again.