During the programming / Adjustment of my sequencer, I often thought that it would be much easier if we could manipulate the keys of the envelope directly via MIDI.
In taking up your vision, I took the liberty of giving an idea of what it might look like.
And clearly, that would be perfect.
On / off the bar and its height are controllable with shortcuts.
All in all, being able to manipulate the keys would already allow it.
But some extra-feature to make it more enjoyable.