Color Overlay on Media Option

If there could be a feature to allow a color overlay and even a gradient overlay with a specified transparency, that would be swell and prevent many from having to edit images/video so text can be seen over lighter backgrounds.

You can accomplish this in the song lyrics editor. Margins tab, Border, check the "Fill" box. Transparency adjustment is on the right.

Great! Is there a way to have the same Fill option under the "slides" edit section?

Currently, fill is only available for song lyrics.