Feature Request: Match all room volumes to group by double tapping

In the app when you slide the group volume there is a knob and a corresponding volume number for the group. Please let me just double tap that "knob" i am sliding to match every room to that number.

Example: The group volume knob is on "21". If I double tap the knob I, all rooms go to volume 21.

https://imgur.com/a/lHvBZO0