That's just another example of poor programming integration with the MFT. That and the SD card errors people w/o nav have been getting is completely mickey mouse and unacceptable.
As for the camera, if you don't get the OEM parts from Ford, I would recommend getting the best aftermarket camera you can get. The MFT is such a nice hi-res screen, I don't think it would look very good with a cheap lo-res camera. It's just a guess, though.
If it were possible after the fact, I would be careful about getting a non-OEM camera. MFT is likely carefully calibrated to use the OEM camera. If you get a different camera (with different focal length; lens distortion characteristics), the overlays that MFT draws over the camera image will likely be wrong.
Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat