Have to concur: the Japanese plane set in the game does not support either a Late War AvA arena or SEA event.
The addition of the Mitsubishi J2M Raiden "Jack", Ki-44IIc Shōki "Tojo", and Yokosuka D4Y Suisei "Judy", as well as a gun heavy option for the Ki-84, would at least make things interesting in a LW PTO map against all the LW USAAF and USN planes available.
Can't see developing the under-armed Oscar, any earlier medium bombers than the "Peggy" we have. Ki-100 too close to the existing Ki-61 to justify development time.
Most of the rest of the Japanese MW/LW additions would be under performers, or had extremely limited numbers developed (single digit and teens like the aforementioned Mitsubishi J8M/Me 163 = 7 built, and the Nakajima G8N "Renzan" heavy bomber, also 7 built). Might be a few diamonds in the rough though, I can't think what right now.
And what is the Seafire doing in the Allies plane set, from Essex carriers no less???? I'm sure there were still a few British and Australian units in the area, but not many, and mostly land based in Indo-China and Indonesia. On the flip side, no B-26's or A-20's? I'm sure the B-25 will be added later when available.
The map however is great.