Minions in nest mode appear pretty similar to goliath. I think it would be fun to allow human controlled minions.
You could play a sort of prequel level to the rescue levels where there is a base defended by turrets and ebon star soldiers/scientists. Your objectives are to break the defenses and track down any survivors or just destroy the base generator/core.
There could be four human controlled minions and one alpha monster and allow respawning minions. You could pit four human controlled minions against one human controlled ebon star commander who basically sits back in a control room coordinating the base defense (requires a lot more programming from scratch, but just a thought). I just think there is potential for human controlled minions somewhere.