Having the option to view the video (especially 2.39 aspect) with a true black background vs dark grey when reviewing full screen is ideal. The viewing experience is impacted when surrounded by a grey box as it is currently. It would be better if it were a true black to imitate how the video would be eventually delivered. Baking in my own "black bars" into the image currently isn't elegant either because there's still a border of dark grey.
Thanks