I agree, this will be a great addition and it has already been added to the Shotcut - Road Map. Auto-Editor, and other similar Python scripts, also have the ability to remove “motionless” sections of video but there’s definitely room for improvement. When I saw “automatic silence detection/removal” had been added to the road map, I suggested adding Automatic Still Video Detection & Removal - Suggestion - Shotcut Forum as well.
-Mike