Wish: Subsurface select for AutoAlign Cplane during commands

i am amazed how well that AutoAlign works and how that opens up new methods of quick drawing.
when i have a polyline which i want to wrap around a cube starting on one side it might make sense having the subsurface with cmd/ctrl shift enabled during commands… or is that used for anything else?

I don’t think this is an easy one. Following your example, once you are drawing the polyline, Rhino is accepting point input and is not in selection mode.