It would be great, when we could stretching and shrinking the selection in the envelope editor. Made a small gif animation.
With proportional options would be cool also. I really like the way Cubase allows automation selection transformation - different areas of the selection that you click and drag on perform a certain type of transform.
regarding OP’s request, if we had modulation options in the automation editor similar to the instrument editor, the envelope stretching would be like increasing/decreasing the ‘duration’ setting from a fader device.
Maybe next to mouse click dragging, it would be cool to have the modulation options for automation generation?