I know nothing of producing games or sound in games but I am blown away from the generic engine sounds I have heard in game from the Videos. They are below par to say the least. I am no expert but how tough would it be to put realistic sound files for the aircraft engine sounds? For example my favorite of all time is Jafaem's who does them for IL2. So I ask Luthier or anybody who has pull in developing to look into this and maybe do this. I think the sound(s) of the game make the game. It would bring more people to the game I think since your making a full Realitisic sim so should the engine sounds.
Ex} imagine IL2 COD your sitting on the airfield in your Hurri or Spit and see a Spit take off with these realistic sounds. I would cra* myself.
http://www.youtube.com/user/jafaem#p/a/u/1/vWk2GI63kWk
Jaffem has many great WWII aircraft sound as well as the bf109.
Just throwing it out there.
Cheers.