what i would really like to see, and should have been done already, as it's one of the most common sense things to have in an aircraft simulator, is an OWNER MODE, like in the Accu-Sim A2A Skyhawk 172, and it's associated ACCU-SIM expansion pack. there you can act like an aircraft owner, keeping up with logs, maintenance and other tasks the owners have to deal with in real life. parts actually degrade with time and stress, and operator actions can speed that degradation up, or slow it down, just like in real life. there is a maintenance hanger, where you can go to take things apart, and see what needs to be replaced, and what is running well. you can also upgrade the radio and navigation stack. it is such a logical thing for a flight simulator to have within it.
lastly, i would like to see IFR FLIGHT TRAINING. it would be great if your flight sim could do MORE to help with your gaining further certificates. i'm not saying it should be OFFICIALLY rated, but being able to have a ground school, and practical flight training, like microsoft flight sim use to have (don't know if they still do), is just logical in my opinion. hope this helps. i would love to see these changes.