not that my opinion matters... but I think if the aircraft was present in the far east, and AH2 has it available, then it should available for use. HOWEVER, I have no issues with putting a limit on the numbers able to be used.
Also, if there is a major player like the Pe-2, Ki-45, or other such aircraft that is not present in the game, there are aircraft close in approximate ability then allow for a sub. Heck, the TBM is close enough to the Pe-2 in performance to be allowed, IMO. Ditto for the Bf110C-4 and the Pe-2 or even the Ki-45. Perhaps even the Boston (no flights) for the Pe-2.
Fill up the skies with as many DIFFERENT types of aircraft available, especially the historically correct one.