I haven't tried it yet but it might lessen the see-saw nature of the game wherein one side moves several units and conducts several attacks while the other player sits there helplessly doing nothing:
Players each play one card face down simultaneously, then turn the cards over to reveal their choices. The player with the card allowing the most units activates one unit (moving and firing), then the other player activates one unit (moving and firing). Repeat until all units indicated on the cards have been activated. If both cards show the same number of unit activations then the player designated in the scenario set-up as the first player moves first.