yeah, this would be great.
i can achieve it but it's kind of a pain to set up. remember that with quick controls, you can control parameters of any plugin, not just the ones inserted on the respective channel. this way, you can add a channel at the top of the arrange (you musn't move it then), and select it to quick control which ever plugin parameter in the project. then, set up a generic remote to control this channel's quick control slots 1-8 (yes, a generic remote's target can be a channel's quick control slider amount). then, set up a proprietary virtual MIDI channel (midiyoke, loopmidi et al), and set up midi channels to receive your MIDI controller's knob movement messages by one of the virtual MIDI ports. then go back to your newly created generic remote settings and select the virtual MIDI channel as the input for controlling the quick control slot amounts as mentioned above.
but yeah, this is a way to do it.
similarly, i can insert an audio > midi cc plugin, and have, say, a kick drum's audio envelope control (for instance) the wet slider inside a reverb plugin on another channel, as well as (for example) the feedback slider on a delay plugin on yet another channel. the drawback is, this only has a 128-step resolution (the resolution of a midi cc parameter*), and is hugely dependent on the current audio buffer size (at least on my system; the greater the buffer size, the more quantized and jittery the results are; plus, the resulting automation envelope differs slightly each time you try to capture it).
* or are there some parameters with a greater resolution, along with an audio > midi cc plugin that would convert the values?