I was going to make this thread after the game gets released since we would know all of the content in it before we start suggesting.
+1 for P-38 and Lancaster
1. Mission Editor
2. Customizable skins or insignias
3. Cooperative missions
4. One thing that would be neat would be a Ta-183 with X-4 missiles just so we can have a taste of modern air combat, but still technically WWII themed.