So, it always frustrated me with how weak artillery and airstrikes were in the game. So my friends and I started a new house rule. We tried to keep things simple without going overboard.
So now, with normal Artillery and Airstrike cards, you roll the same amount of die to see how many casualties your opponent takes, you then conduct a suppressive round of combat. This way you can eliminate units and you also pin or disrupt your opponent. When we played we did not rout units this way, though it was a concern that these units could be routed too easily. I think this makes artillery and airstrikes adequately more powerful than your mortar crews.
With suppressive Artillery attacks we have not come up with a really clean fix, though we were considering allowing suppressive attacks to conduct a "normal" attack with reduced dice, say 1/2 the numbe of dice for the normal attack.
What do you think of this possibility?