With Coh2 on steam the level of potential punishment is much bigger. You can not only get your game account banned, but your steam acount, which possibly is bound to a lot more than just COH2.
No, you can't. Even if we would like to do that, there are certain laws that forbid these actions. Full Steam bans have never happened before and they will also not happen in the near future. Also, I would feel uneasy when the decision about my whole library of games depends on some lucky arty strikes I may land in CoH 2 and the verdict of maybe one admin.
Don't get me wrong - I hate cheaters and were an active reporter of these folks when it still was possible to do something against them, but we need to keep a sense of proportion.