If it came to the wishlist, I would say Kuban winter campaign map.
A China map should have a lot of potential for historical mission builders.
You've got Flying Tigers for one and the Nationalist forces were eventually flying B25s
and the industry moved just like in Russia, with Japanese bombers in pursuit.
Even after Japan surrendered the Russians just kept on moving in the north.
There's the Burma -China road.
I'm not absolutely sure, but B29s may have been based in China for a time.
Map building itself is still a mystery to me. I have looked it up, but never found out much at all.
That it could be accepted in the stock version, if it were 100% original, makes it even more interesting a subject.