Would someone be able to code a simple plugin that disables mobspawners per world? ie in the config, you just list the world names you want mob spawners to be disabled in like world1,world2 (By disabled I mean mobs don't spawn from them) I've been scanning the bukkit forums and bukkit dev for at least an hour now and can't find any plugins that do this. I'm sure there are other admins who would use it.
