Thanks for your review!
It's still unclear how we could expand it but one of the earliest ideas did not have the rear view mirror at all! I actually built the code around having to manually look behind your shoulder in a first person view while driving the car. In the end we didn't do it that way but I really want to do it in the final version as I think it would add some tension to it all.
Look forward to the final version, you might be surprised!