Hi.
This has already been mentioned by multiple people but I also hope to see some alternative logic to modelling engine limitations instead of time limits.
Another thing I'd be glad to see improved, over the current generation of combat flight simulators, is the documentation of aircraft performance. In simulators like DCS and Il-2, data provided on aircraft performance, like speeds at various altitudes, is quite scarce and pilots have to do much of the testing by themselves.
It would be amazing to have, for example, speed/altitude graphs or climb-rate/altitude graphs for the airplanes from the get go. Even better would be energy-maneuverability diagrams if the developers will have time to make something of that sort.
Regards
ColourBlindPilot