I only do sim racing in my cockpit, and currently only have one sensor (got my CV1 before the summer sale).
I have noticed that when I record my races, the recording from the mirrored screen seems shaky. I'm not sure if this is because tracking from the one sensor is not as accurate as I would think it should be.
Would plugging in a second sensor at the front provide additional tracking to help smooth out the mirrored screen, or does the tracking only use one sensor at a time, and switch between them based on where the HMD is positioned?
Your recording is picking up all the small head movements that you are making naturally. You don't notice this while you are driving (just like in the REAL world). My main interest is Flight Sims and I only use one sensor when sitting in my sim cockpit, you won't need another unless you want to use Oculus Touch.