Looks like great news!
Although I have rather little experience with the FMB I immediately spotted some features that I was missing in the Il-2 FMB and some I didn't even know I might miss
(The interpolate alt/spd options haven`t been around in Il-2, or have they?, +weathering, +weather conditions, +apparently much more precise fuel/loadout options, +,+,+)
What intrigued me most, however, was the ammo belt option - can you tell us to what degree it will be possible to manipulate this as mission builder/player?
In any case: thanks a lot for the update, Oleg!