[ReBel]

I am sorry to report that yes, the cheats I found do work under MP, therefore I will not be passing this info on to anyone. Please be aware what to look for, because I'm sure someone somewhere will find and use these cheats while hosting: god mode, clipping through walls, floors, ceilings, ability to heal ones self instantly, shield, and the ability to have all weapons at once. Be on the look out.
Personally, I will only use the all weapons cheat on coop games.