My play group runs out of Japanese tanks. They usually get two IC’s in Asia, and go for the tank March to Moscow. I scavenged extra tanks and roundels from my original Axis and Allies game.
In AA50, enemy subs and transports can be completely ignored, as long as you don’t engage any of them.
(If you attack a sub/transport combo with a fighter and also try to land there amphibiously, the sub can sink your transport. You can’t pick and choose what to ignore within a single zone)
In that case, any hits scored by the fighters have to be assigned to the AC. The only units that can hit the subs are the cruisers and that is only if the subs decided not to submerge. Plus they would get their suprise strike. They can submerge because there is no enemy destroyer. Basically, destroyers are anti-sub units. Also, remember that hits scored by subs can never be assigned to aircraft.
I agree with your rational, but I do feel that Paratroopers belong in the game. I don’t know the solution though. Perhaps they could only be used in attacks where at least 1 other unit is also attacking the same territory by land or by sea. (I would make an exception for islands and perhaps undefended territories.)