Just FYI, ejection seats weren’t put into widespread use until the late 1940s/1950s, so it would be realistic in any way for those to exist. During that time, bailing out was still the only way to escape an aircraft. Also the P51, B29 and P38 weren’t in operational use during the time period (For example, the Mustang I, the British version of the P51 (remember, it was originally a British order), the first production variant of the P51 didn’t enter operational service until January 1942). I would also ask for more clarification on what you mean by ‘more game modes’ (e.g. other than Mission Creator and/or more short missions?). And for ‘more threats from the ground’ do you mean like searchlights? Anti air was basically the only threat from the ground during this period - SAMs definitely didn’t exist.
But I would agree about a (toggle able) mini map, and would add my own about making Defiants act as they should to utilise their weaponry properly (without forward facing weapons, it’s useless and an easy way to get shot down to fly as if you have forward facing weapons), and should position itself appropriately.