Touch to join to add a zone to a playing zone

It would be great to get a button (within zone control and/or volume control) to join the currently playing zone.
Use Case: When I listen to music in my living room and I go to the kitchen to add a second speaker, it would be nice just to touch a button instead of selecting zone → group → add to zone.
It would make just a little bit easier.

+1 vote from me.