Keep in mind that Pigments only have one output VCA. Everything is affected by that and by any modulator that modulate that output, even if the Env VCA is set to have full sustain and release only.
I don't think being able to freely use another modulator like another Env instead to control the VCA, will make any difference in what this thread is about, because Pigments still only will have one output VCA.
This feature request only make sense to me, if it's about wanting a second VCA and to be able to separate and route different signals to two VCAs, to get two indpendent synthlines like you have in CS-80 V and Modular V.
And then perhaps have one more Env.
Having two independent signal lines routed to two VCAs is the only way to in all cases have complete full control over two parts of a sound.
Such a change require a lot more than just a small Env adjustment in Pigments. Beside a extra VCA it also require a way to separate and route two signals to the 2 VCAs.
What's possible now is to use two instances of pigments, if it's in some cases should be needed. This could in example be set up in a Analog Lab Multi. But can also be set up in a DAW and in other ways.
It's off coarse also possible to use all the excisting modulation possibilities, with the limitation a single VCA in some cases can give, where you actually need to have two independent sounds that each in example use a Env for a VCF and a Env for a VCA.
Stephenm have asked about, if this is about wanting another VCA. I think yes it is. But this is just my thoughts and what i think.