Thanks :3 !
Well I'd certainly like to help however I can; there regularly are griefers/hackers plaguing the server, though most of the time it's a bit of a self-defeating activity (you can't exactly grief a server to oblivion, then jump onto another one to rinse & repeat, since there's only one of them active; if you kill it for the night, you kill your "hobby" on that game for the night).
Right now, I'm trying to produce .demo files to expose griefers/hackers, but it's not always possible to catch them red-handed - it'd require recording whole rounds and editing the video to extract the moments where you can see them griefing. It's easy when someone just blocks a passageway and prevents further progression in the map, but it's much harder to catch in a .dem when it's about setting up "TK Traps" with props/explosives, or just speedhacking around a group of zombies.
About ZM, I'm quite certain that what's killing the game is a definite lack of publicity. The project got orphaned a long time ago if I'm not mistaken, so one really is promoting the game anymore. Which is a shame, really - because the concept is original and very well achieved. For instance, I recently tried "No More Room in Hell" and ZPS, and while both games were more "fleshed out" than ZM, in my opinion they felt more like feature-creeps compared to the pin-point design of ZM.
I'm quite sure a polished, promoted version of ZM would be a real killer; I'm told ZM2 was to be that, but sadly they botched it so terribly that it had the opposite effect on the game.