I have a full post on this and some other stuff I'm putting up later, but one of my idea was for generals to be able to place markers to "direct" or "give priority" for creeps.
Ex: place a "catapultasauria attack this" marker to get them to focus on destroying a tower or "minotaur guard" to get your minotaurs to protect a flag.
This gives generals the ability to direct their team's creeps' actions, but not complete control.