@General:
The restriction on the Flying Tigers to ground operations is understandable, but one provision I would allow is the expansion of potential Chinese campaigns in Korea, Hainan and Formosa. In the case of the two islands, the Chinese should be allowed to board American transports only to attack those territories. In fact I would make China the original owners of those islands, so they’d be liberated anyway.
In the case of Hainan there would certainly be a historical justification for this because the Pacific 1940 map contains an error: it shows Hainan as being a Japanese territory (with a Japanese roundel), not as being a Japanese-occupied Chinese territory (with a Chinese roundel and orange borders). Hainan was a Chinese territory until 1939, when it was occupied by Japan, so it should be depicted in the same way as Manchuria (annexed by Japan in 1931, as I recall) and Jehol and so forth – not in the same way as Formosa, which Japan picked up way back during the First Sino-Japanese War of 1894-1895.