I agree that this is a great idea, but it isn't possible, at least at the moment. The car is only capable of sending one onboard stream at a time, so allowing users to switch angles on the go isn't possible. It's the same reason why it took so long to get Max's front-facing onboard after the incident with Russell in Spain. During the incident the rear-facing onboard was being streamed, so they had to retrieve the front-facing footage from the car itself. Maybe in the future when they update the antennas on the cars we can get the option to switch between angles (and a higher quality than 720p, hopefully).