Permissions for the plugin are fairly simple.
Allows players to enter/leave ZArena games.
Allows players to vote on maps.
Allows the player to control games. That means starting/stopping, choosing maps to play on, setting players as alive/dead, and a few other things. It does NOT mean they are allowed to create or remove maps, or edit existing ones.
Allows players to set the kills of other players using /kc set <player> kills.
Allows the player to create, remove, and edit maps.
Gives the player all above mentioned permissions.
When a player has this node, they will not automatically be put into the game when they join the server, regardless of configuration settings.