This has Pro Mod and Wall Hack (Walk up to walls and see through them, just like MW2). For some reason Treyarch cheat protected that harmless stuff like cg_LaserForceOn but didn't touch the DVARs you can actually cheat with.
No, you DO NOT have to be host.
Every time you die, you need to press BACK for it to enable again.
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Here is the DVAR if you want to add this yourself...