Feature request: temporary schedule override

[hexuallyactive]

I have a use case where I'm displaying a message of "ON AIR" when I'm on a Zoom call or similar, like a recording studio. It would be nice to have the option to have a single app basically take over for some period of time and disrupt the cycle as an always displayed message, and then resume the schedule after the period has expired.

[jaredhaight]

Another use case for this could be sports games. I'd love to have one of the score apps be able to stay on screen during the game.