I add my voice for this. If we can’t have the proximity sensor please allow us to disable this sleep mode completely. It affects now not only my video watching, but also in game like Elite dangerous, I already got the black screen (sleep mode) twice while flying on straight course.
Gyro-based sleep mode does not work and can’t work for the intended purpose as there are quite a few situations where my head is simply not moving (watching video, flying straight, pondering chess move etc.).