Hello @SiWatts69,
Thank you for your feedback. If it is possible, we are planning to add a "Blackout" button in the next release for Cuety. The "Fade out" button you describe sounds similar to a grandmaster fader, which is not something we consider adding to Cuety.
P.S. There is an other way to achieve what you want, but that would mean extending you setup with an LPU2 and a B-Station. If you are interested for more information please send me a personal message me.
Best regards,
Michael.