Well, I got my JGC Limited back from the 2nd dealer with the "2nd opinion" on my jittery/jumpy rearview camera. Here is the official write-up:
"Per Chrysler camera is working as designed the flicker customer is describing is the focus feature for that camera."
So there you go...Chrysler technicians say it is the focus feature on the camera, and that is how it is supposed to work.
I'm still convinced it's a software issue, and I'm hoping they will address it soon in an update. One can always hope.