If you use Orokos, you don't have to worry about people faking their rolls, then they would have less input with you.

The only thing I think should happen is have private "search" rolls and "stealth" rolls, where at the beginning of their turn they can PM you to see if someone is hiding in their spot.

[url=http://www.roleplayerguild.com/posts/71722]I'm running a PvP / Survival type system as well, so you could see it in action here if you'd like.[/url]