This should be a very easy implementation (I hope its not already in).

For our house of worship I use overlay 1 for lower 3rds and overlay 4 for speaker name, which are intermittently used thru out the service. I use overlay 2 and 3 for situational needs, sometimes overlay 2 will be my countdown timer that I only need for begging of service, so I use the awesome feature where I can show/hide the last input that was on the overlay so I can reuse my keyboard shortcuts. (i don't want a million shortcuts for the volunteers to remember). Because these 2 overlays can change I would love a visual indicator on the input button (just like when the overlay button is an active overlay). The big ask on this would be to also change the Title bar of that input if it is minimized (just like when the input has been designated to an input group).

This would help me reduce live errors when I forget which input had been used... i do use the left click temp overlay to help mark/set that input to the overlay. So this use case isn't a critical need, but most of the programming design is already. Anyway just an idea.