I would love it, but I wouldn't like it if it took talent and development away from the current project. If HTC speads too thin, both products would suffer.
Now if it were all inclusive, all done in the same program, and you either chose one of many korea arenas with appropriate planesets inside, or on of many wwII arenas with appropriate planesets inside (it could keep expanding, all within the same program). Offline, you could have any plane you want to kill those circling P-51's....