I'm still hoping for that system volume feature like MJ/MC, where the MB volume control syncs with the PC and when you adjust one, it adjusts the other in unison. Disabling it would be okay too, but that would mean you could only control it from the PC, not MB, which would not be as convenient.
I visited a friend of mine recently and he was using a mess of 3 volume controls! He was using MJ14 like me, but didn't have the volume set on system, so he had 1 volume control for the music player, another volume control for the PC, and another for his speakers. I corrected his MJ settings to his delight so he is now down to 2 volume controls. I recommended he get USB speakers with volume sync to get that down to one, like I have. It just sounds better and is easier to use.
If MB had that function I think it would be perfect, and I would switch to it from MJ14. Until then MJ14 soldiers on for me even though it's development ended long ago and it is stuck on 5 star song ratings with no half stars.