There's not necessarily routing with a VCA - so your 3 tracks controlled by the VCA could all have different outputs, but their relative levels are controlled by the VCA channel/slider/envelope. I've previously suggested what @Base 57 has, which feels like the "Cakewalk" way of doing this to me.
As an aside, these two requests are so far down my list as to be insignificant.
I mainly want to see a "hybrid audio engine" (cf. Reaper, Logic, Samplitude, Cubase - all have something similar that improves performance on non "live" tracks) to bring CbB's performance up to match theirs. And support for more control surfaces "natively" (ie. not via ACT or the excellent AZCtrl, but with Cakewalk working with the hardware manufacturers to integrate the devices).
Note: neither of these actually benefit me as I don't max out my CPU and don't use a control surface - I just think these are the key missing features that means CbB can get overlooked.