Presentation background color

Need a way to set the background color (not on the canvas, but the overall background) in presentation mode to something other than white. 50% gray would be ideal for most use cases, but perhaps it could be set on a per-document basis. I wouldn’t need it to change from one canvas to the next, but even a global preference for the entire app would be better than being stuck with a white background all the time.

Seems like a pretty huge oversight, unless nobody’s actually using presentation mode.