and to ad about the SDK tools, at least as Oleg said in the past, these 3.Party aircraft can only included in the game with a limited FM (and perhaps DM) calculation.
So, full FM calculation is still in the hands of 1C - and if a 3.paty aircraft will be added to the 'closed' game (means switch "no mods" enabled!) it will get the full FM.
a pure guess from me is that 1C will sell a licence for 3.party developerd like accusim (
http://www.a2asimulations.com/accusim.html ) , that they can make adons with full FM and mapsize and are able to sell their work. If this content than would be mods "on" or "off"..... good question.
At least Oleg said in the past that he would like to see that 3.Party developers, that are working for M$ Simulators for example , would also work, even swtich
, to his CoD engine
time will tell !!