Simply, add HUD functionality
Modern cars have it and it proves very beneficial, but not all of us have the latest and greatest but everyone can afford a smartphone with decent screen and a HUD glass contraption/tray to place their phone in. That would be sooooooo SO SOOO awesome if you could add those few lines of code to flip/mirror the image. It can't be that hard to do if other (free) apps can do it? If you also made your own "HUD tray" that would be even better "shut up and take my money" I would say.