Whether or not this was an official thing, there was a player class in the tab menu called admin, which normally had an odd player model to make this stick out if you was visited by a no-clipping (most of the time Gman). The character names were usually [CG-A]John or [CG-SA] Nick.
They were easily noticed on the scoreboard which made it easy to PM them with problems (rather than find the digits of a CCA number of an admin). Also because they were on this "admin character" and not a unit or a citizen, they could go out of their way to teach new players and/or discuss fallouts between players.
If it were possible you could have an admin on one of these characters as often as possible to be there as the single point of contact, of course that would mean they would be missing out on RP for some time but ultimately they could organise a swap out with another admin at some point.