I would like to request the feature be added to allow the volume up, down, and mute media keys on Apple Keyboards to control the Main output 1 & 2 levels when selected as the system output. It could simply be a checkbox to turn on and off inside of the Universal Control app. With this feature the main knob on the audio interface would still control maximum output volume, the keyboard control would simply reduce or mute the level further.
Because my interface is not as close to me as my keyboard it would be helpful for quick and convenient adjustment of volume levels.