Blackout screensaver mode for stream decks

Heyya!
I was just in a mix playback for a series episodic, and our playback custom is lights and screens off. When the machine went to sleep, the SoundFlow screensaver kicked in on my stream deck and I had to sit my phone ontop of it to block the light. It would be cool to have a screensaver mode that is a pure blackout for such situations :)

Thanks!
Dustin