I really don't see a reason why this shouldn't be added it saves so much time for staff and for players.
~ @flyingscrub
Yes.
It saves me 30 seconds of typing out a list.
Elites can own all natural spawners.
Supremes can /spawner : Zombie, Skeleton, Spider, Cave spider, pig
Ults can /spawner: The above + Blaze, Enderman, Cow, Sheep.