Suggestions should be made by filing an issue in the appropriate repository. Although issue sometimes means “bug” it can also be a feature request such as this one.
In this case you want to have a feature added to one of the UIs, so your best place to start is with the UI repository.
Just keep in mind, that filing an issue does not guarantee that someone will attend to it. All the devs are volunteers and if you can’t make a case compelling enough for them to consider it worth the time and effort it won’t get addressed.
First thing that popped in my mind. I use the oh-link with an icon and color formula in the props with a little css to make it small. With that you can make it look like anything you prefer. For me a grey button when it’s off and green when it’s on. I even add a slider so instead of on/off you can swipe the button to a color or brightness selector.