Here is a list of easy to medium change that would make this sim even greater :
-ability to make race laps in reverse direction.
-ability to modify settings without exiting the race (just with pause)
-ability to disable door and tree collision (make message in red instead like 'you would have crashed')
-more sexy main menu and interface & possibility to run non fullscreen (I'm often checking drone stuff on internet while doing sim)
-ability to modify door size and shape !
-simulate video quality receiver like on both versions
-possibility to save/load settings as a file
Congrats, this program is optimized and feel pretty good and this is great that it is multiplatform.