Change the Health of the Villager (Due to Bukkit limitations the max is 30 hearts)
Make your own maps and set the spawns!
Set the lobby time and spawn!
Does not take over your server! It can be as big or small as you want! Just protect it with WorldGuard or do not allow players to be able to reach it. Don't worry about players ingame because they cannot break blocks.
Set the armor and items that each team spawns with!