It would be great to have a preset volume when switching groups.
I combine speaker groups, like my open kitchen and living room, during the day to play music, but in the evening I only play my tv sound in my living room. In the morning I always have to adjust the (tiny) sliders to readjust the volume of the two groups.
It would be good for a group to have a preset volume, so I don't have to fiddle with the sliders every day.