It's not exactly what SPCM did, this looks more advanced with more responsibilities. The SPCM team consisted of a small amount of APB players who wanted to assist players in the game.
We did not monitor the chat (well, if it wasn't related to help requests - we didn't do anything with the chat), we did not do anything related to cheaters or rule breakers (besides reporting them on the usual way: support tickets). We were regular players who were recognized by GamersFirst as a "player assistant" with a fancy "<SPCM>" tag in front of our names so players could recognize us. We were also extremely active in the "Guides, tips and Strategy" section. We did not have a shorter line of communication between the APB Management Team and SPCM, we were regular players.
I am not allowed to go into full detail since we did sign an NDA. In a nutshell: using the tag for anything else than helping players who had questions would result in a punishment. This 'community GM' does look like something which will give you more responsibilities. You could see this as "SPCM 2.0"? Hah..
Anyway, Lixil is perfectly capable of determing who is capable of being a marshal (GM) or not.