I know this goes without saying, but I'll say it anyway. Definitely make sure you shoot in 4K, not 1080p.
No reason for higher frame rates. In fact, I would suggest 24FPS would look more cinematic in a final edit. Go with native ISO and 1/50...
I assume this option is available for compressed video modes only (h.264 and/or h.265). Correct? I assume that this option would NOT be available in RAW or ProRES modes. Correct?
I did some quick research, and DCP seems to be utilized mostly...
Hmmm...it sounds like cheating dynamic range by changing exposure setting mid shot, which would be unacceptable in any pro setting. But I could be wrong. I'll research this. Thanx for the heads up.
D