Thought I'd make this for giggles before I hit the sack. Enjoy! ZOMBIE APOCALYPSE v1.0 [556] (Although because it's so simple it's probably going to work on newer releases) Features - Slaying a zombie causes 2 more zombies to spawn. WARNING: It's pretty obvious what's going to happen. If you want to try out this prank be sure to have backups & worldedit's /butcher at the ready. http://rapidshare.com/files/455338556/ZombieApocalypse.jar
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This could be a nice game-type if you can make it work only for specific worlds. Can that be done? If world in configlist then spawn 2 Also make it work on other mob type.
I just thought about something, I haven't tried your plugin so I wouldn't know. There should be an option so that if the zombie/monster is killed by lava or fire it does not multiply. (I do not know right now if the plugin makes the 2 zombies spawn at the death's location. If it does, it could be a problem if they both spawn in lava and then spawn 4 more in lava...)