You may notice a sentence like this in some areas of FS-FlightControl:
All functions in this module are highly aircraft dependent.
They may work well with third party aircraft, too, but we can only guarantee that they work with all default aircraft of flight simulator.
This restriction arises due to the fact that several third party aircraft vendors do not stick to the default flight simulator access functions, but use their own proprietary techniques.
Obviously we therefore cannot make sure that every button in the program areas where this info is displayed work with all third party aircraft.
Note: This applies only to few areas of the program and does not mean they do not work with third party aircraft, we just cannot guarantee it.