Well, as the source code for the core game will be off limits until MG takes down the sign or does a new core engine in 10 years, the best solution to this would be that they released the SDK that was actually "promised". Both for aircraft and maps. That way we could get flyable Defiants, Whirlwinds etc and all bases corrected with every last shithouse in the right place as it was in September 1940
And we could get a Spitfire IIa "community edition" to use at servers that allow that. Maybe MG could take the time to add the best community effort to the "official" base plane set too? At least the most needed ones...
It does not matter if the SDK is crappy and without documentation. I'm sure a lot of enthusiasts would wrestle it around rather fast anyway....