Basically how the input overlay key defaultly changes to a light orange whenever you tap a key/a magenta looking color when you click, I suggest that you be able to change what color it changes to, so that when you have a blue input overlay key that's blue, you can change it to something like yellow or red. (Not talking about the text, just throwing that out there.) It's really just a small thing that most likely no one cares about, but I feel like that it'd be nice to be able to have the keys change from red to grey.
What I mean
Change the color from this
To something like this
To something like this