WORLDGUARD-2382 - Reported by leponder

You can set a flag on a region to deny all spawning or deny certain mobs, but in conjunction with Craftbook it would be nice to specify a flag like 'no natural spawning' of mobs. Let's say a creeper for instance, they would never spawn naturally in a region when this is set but still be able to use the mob spawning Integrated Circuit to spawn creepers artificially without the Worldguard region blocking it.