I kinda like that in cinema, the film between the perforations on one side is used for sound info. Seems like a pretty decent attempt at making use of the area available! Shame our cameras couldn't record exposure details in that area or something cool like that! Or are the camera's that can?
That's not the case at all, actually. The uninterrupted film between the sprocket holes and a smaller image is used for analog sound. Later, the strip between the perforations and one edge came to be used for the digital sound track. The area occupied by the sprockets is not and has never been used for cinematic sound.