I saw Frogboy's post on setting a maximum amount of mana that you are willing to invest in an auto-resolved battle.  I think this is an excellent idea.  I would go further, however.  For most battles, I find that I use the same tactics everytime.  I also find that the AI tends to be awful with respect to its spell choices.  I was just thinking this the other day while playng King's Bounty: The Legend.  My troops were sufficiently overpowered that it wasn't really an issue, but man did the AI waste mana on pointless spells. 

My suggestion is that it would be great if you could specify tactics and spells to be used in an auto-resolve battle.  For example, start with a buffing spell such as speed, then charge, and cast a healing spell if a unit gets to below 25% hit points.  I have confidence that Stardock can come up with pretty good tactical AI, but the combination of units with spells is an order of magnitude more complex.  It would be great to have some control over the spells for auto-resolves, beyond just limiting the amount of mana to be spent.