ok not sure if trolling but essentials lets a server do this... or if this topic is just outdated... also timed spawning is spawner blocks all of this can be done. Heck with a different plugin you can set powertool to spawnmob (name) (amt)... I think that plugin is either essentials or worldguard. But maybe I'm missing what you're saying?
Where 50 is the amount you want to spawn. You might want to use the actual name of the mob found in minecraft.jar, too.
Ah. Whoops.
Yea does anyone have a mod for this though? for realtime editing
Really need this