The Gamemaker controls are pretty neat so far. They have some admin only ones that control major things (Like respawning everyone) and then some minor things that normal people could control (like releasing zombies into the arena).
I'm not really sure how I want it to work. The game can run automatically, but a gamemaker can make it more interesting by controlling the arena. They can also spawn items or supply crates at certain areas, so players can compete for supplies.
While it could be neat to have player gamemakers, they wouldn't do as good a job as admins, and they could abuse their power to make it impossible or rigged in one user's favor. It will probably only be admins and trusted users.
If you have any neat ideas for the gamemaker to be able to do, (that aren't too hard to make) please post them.