Ki-43 - Probably the most important Japanese plane missing from the set
Ki-44 - Another major player by Japan in the war.
Ki-45 - Japan is missing an appropriate heavy fighter. The last time I flew in a scenario involving Japanese heavy fighters Bf-110Cs were substituted. It's not a real replacement.
J2M - Would offer the Japanese plane set its most competitive design in late-war scenarios
B6N - It would be at least SOMEWHAT more survivable than the Kate
D4Y - Ditto for the Val
F4F-3 - The F4F-4 with 4-gun package is more accurately an FM-1 and not actually a substitute. The F4F-3 was slightly faster, lighter, and had more internal fuel.
TBD - Let's face it, it's just not right having TBMs at Coral Sea, and more than six of them at Midway
SB2C - Main USN bombing platform for end-war scenarios.
B-17F - B-17G is inappropriate for any PTO setup. Plus it would allow famous skins such as Memphis Belle.
B-25J - In both glass and solid-nose 12-gun strafer versions. Most representative B-25, and would offer a somewhat more survivable level bomber option than the C.
An AP mix option for the B-25H's main gun
Tiny Tims
Centerline external stores hardpoint for the F4U-1D/C and -4 with 2000lb bomb option