Assuming airdrop is intended to use up both actions, in order to prevent you dropping in behind enemy walkers and shooting them in the back in the same turn…
It seems like airdropping a heavy that is carrying troops is a way around that. Get fireball, spend the 5 ap to airdrop it, start it with gunners + extra bazooka + rosie (or tank busters, etc) embarked in it. Airdrop 12" away from enemy in its back arc (to one side if necessary), troops disembark and use their other action to shoot. They should be in range even without a move, because they can disembark up to 3" away from the heavy carrying them. No armor roll due to back arc, no cover because of the ugl. Should outright kill a medium walker, decent chance of seriously harming a heavy walker.
Lot of points in one place, and walkers already have a disincentive to advance… but it sounds funny at any rate. Anything in the rules that would prevent that tactic?
