A4 feature request - mixer page for headphones/stereo out

Hi,
I tried this week to use my headphone output for videosync as I was playing and I realised that when stereo outputs were used, headphone was muted. Could it be possible in a future update to have some kind of mixer page (like OT) that would enable to route one or more tracks to the headphone output (that would enable to use external effects for example) while the remaining tracks would goes out the stereo outputs?
What do you think of it?

hmm never heard of that before on other gear

have to check it out