Not change def device for phoning
Describe the solution you'd like Now, when i change default device - it change both: volume device and phone device. In sound settings windows have TWO checkboxes - one for music and one for phoning. Or will be nice to see and change both of them in menu of Volume2. Music device with left button (how it works now) and phone device with right button (for example).
Probably this option can help you:

Will try. Right click on menu look some strange ) Can it be more transparent for use? Understand that it is window - so can i offer to add checkbox for separate sets? After click with checkbox - will ask in same manner as main windows but for option from right lick menu.