This one is definitely sillier but, some time ago maybe 2.7'ish, we used to have the ability to pause then accelerate the F11 free cam to match the speed of the aircraft we are filming. This was super beneficial in creating content as we didn't have to constantly scroll to catch up to the aircraft (for those of us without friends to fly chase plane for us). Would like to see it again some day. Also, the ability to move the camera while padlocked would be super awesome as well.
This vid starting at 22:38 help to explain it a bit better: