no atc (I prefer IVAO's ones), no tower mode, no kiosk, no video capture (I prefer fraps or cam to share).
No rewards used, some rare adventures, those we bought in our softs or find freeware are often more interesting.
Uneasy to change smoothly in external view, especially zoom, when making a video, to be upgraded.
Hand made weather is nice when you want to practise some exercies, like crosswind landing, or holding pattern with wind. Except this case, only real weather. So I think real weather should be a prioritary mode.
Thermics for glider should be better. Either you see, either not. unsatisfying.
Very hard to create things like thermals, to be improved.