What I'm suggesting, is adding generic enemies to the game that fall into specific themes like say mobsters or ninjas that would count as levels 1-54. Just have them be in the MA editor when picking stuff to put in custom groups or as bosses. This would make setting up a custom group easier. You could get the kinds of enemies you want in your group without being stuck in a specific level range or using up chunks of your file space on custom critters.
What I'm suggesting, is adding generic enemies to the game that fall into specific themes like say mobsters or ninjas that would count as levels 1-54. Just have them be in the MA editor when picking stuff to put in custom groups or as bosses. This would make setting up a custom group easier. You could get the kinds of enemies you want in your group without being stuck in a specific level range or using up chunks of your file space on custom critters.