I was thinking for Unit Cannons that there should be some way of firing decoys. Like, if you built multiple unit cannons, you could fire all of them simultaneously with ease, so that enemy defenses might intercept only one at a time. Thus, you could fire your commander out of one, and tanky units out of the rest to keep your commander safe. I had also originally imagined that unit cannons fire units whilst inside of destroyable pods, which frankly works even better because then the payload is diguised.
