What’s the idea?
If the envelope could be routed to a matrix input or output level, it would save a CV output and an external VCA, by using the attenuation of the matrix to control the volume envelope directly. Summing would probably be the most flexible: the level of the input or output is the sum of the level set on that input or output and the envelope. Set the level to zero to get a standard VCA behaviour with nothing passed through except while the envelope is running.
Where would it go?
The envelope output selection menu.