I would think that one could choose anything using the this engine? How about Korea, Vietnam (missing an air mobile insertion element)... How about a real tough one....... Guerrilla warfare. Iraq, Afghanistan........... the idea here would not to have goals as to survive with the fewest losses. That opens one up to placement of mines, IEDs, EVPs, ect.
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Since writing the above I have created scenarios based on the Pacific war. Main issue here is getting the terrain models correct. I started with Guadalcanal and have moved up to Saipan and Iwo Jima. My troops are Marines various Japanese forces, and British. The original terrain maps were hard to find for various scenarios. TOE equipment list not so much so. Setting up scenes is as much fun for me as playing the game. I am doing some Korean War and Vietnam ones as well. I deal with Air mobile insertions the same as I do para drops. Works just as well.