There is a whole pile of Japanese aircraft that are lacking in AH.
As much as I would love to see them all I have to wonder if it is the lack of data preventing them from being added.
I've seen pyro's office, (Yes, its cool) and its stacked to the ceiling with books about aircraft.
But where do you get truly believable data for planes like the Ki-43,44,45 ?
So much of that was destroyed in the process of defeating the Japanese.
Granted we have some pilot accounts, but they do not give you weight, wing area, speed, or all the other numbers that to faithfully portray the plane must be "right" not just "fudged".
So while I would love to see a whole raft of Japanese planes added I'm not holding my breath.
I just don't think they have the sources they need to do them justice.