Yes, I know it has to be stretched to fit the Control Display. It looks like a widescreen display which is what you get when playing DVD movies. It doesn't bother me.
I also found that there are no video drivers which support the RCA/Composite video on the car display. The CCC input works on 640 x 480, 800 x 600, or else it turns black.
The setup is dual display and it supports both monitors, but you're right they show the same thing. When you hike the resolution, the car can't display.