Perhaps one of the non-populated arenas could be converted to a Post War arena, where F7F, F8F, P-63s and other post war birds could fight it out. I think part of the fun and attraction of a 'SIM' is the "what if?" scenarios. It would be fun to see how some of these birds would have performed if the war had gone on for a few years longer. I believe a long time ago there was a sim called 1946, or something like that, I think this was the premise. It may also have contained some planes that only made the protoype stage like the Do 335[?] Arrow, the German interceptor with a pusher and puller prop, among others.
I get the value of the current HTC rules for plane inclusion in the game, but the historic representation is a bit compromised by lightning fighting mustangs fighting corsairs etc, anyway. Perhaps a Post War arena would be fun enough to warrant adding planes that don't meet the current rules for inclusion just so we could see "what if?"