This is another plug for the Sherman tank with options available in the hangar, like swim floats and Calliope rockets.
A Pershing would be nice, too.
And a Ki-44.
(edit: some points I want to bring up)
A ki-43 would be garbage unless there's a Flying Tigers scenario involved. A re-skinned Zero would be just as good a substituted for the Ki-43.
I'm guessing that most of the people clamoring for the Ki-84 remember that plane from Air Warrior. The IJ forces need a competitive airplane and the Ki-84 could be it. I'm guessing it would be perked in the MA and therefore we'd still see N1k's as the plane of choice by IJ fans.
Which brings me to the Ki-44. The variant that had the highest production was the Ki-44-IIb, armed with four 12.7mm machine guns. Later variants included options of four 20mm cannon or two 12.7mm guns with two 40mm cannon.
Major advantages of the Ki-44 were high speed and rate of climb; however, it had a nasty habit of high-speed stalls due to wing loading. A total of 1,225 Ki-44s of all types were manufactured, which is respectable considering the total number of Japanese fighters produced by Japan.
Given the armament and flight characteristics, this plane could be effective in the MA as a bomber interceptor (its historical role) without incurring a perk penalty.
That, and its a nice looking airplane.

