The dev manual explicitly says:
Aerofly FS 2 currently supports the maximum level of 15 which gives you roughly a resolution of 50cm per pixel.
There is a growing number of ortho-photos available in 20cm resolution, even Open Data ones. It is probably not practical for large areas, but around airports or POI, why not? I would not call that a must have feature, I am just curious.
Keep up the good work.
Sam