It would be very useful to have the ability to create multiple groups that can be quickly enabled and disabled. Mixing from music stems in a program more often than not has all tracks at equal levels, but occasionally one needs to ride an dividual stem. In this instance it would be great to just quickly disable the group, maks the adjustment then re-enable the group immediately post tweak. I find the same thing is offer require with Foley premixing. A good Foley engineer will get the levels most balanced and the mix is often riding the group of feet but also with a lot of individual riding required for perspectives.
Qlink and abs qlink work well but the option of something a little more semi permanent would be great..
The ability to toggle these group states from the timeline as well as the mixer would be a must for efficiency too.