Okay, so I had this in the airpower discussion but since I always liked the idea I figured I'd throw it in here too.
How about if airstrikes could be set to op-fire with no on board LOS requirements? Kind of like having aircraft on station for targets of opportunity that they and only they could spot.
Imagine taking 4 or 5 JU-87's, assigning them to op-fire, and then hearing your opponent moan about how one of his HQ's got taken out by an airstrike when it moved. Or even better the satisfaction of finding that a column of T-34's rushing to meet your breakthrough was wrecked on the roads by air interdiction before it even got to the fight.