Curve tool with control nubs

It would be realy neat to have curve tool with control nubs like in

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Sometime ago I thought about the Tab key as a way to switch between control points while we are drawing a curve. I think there is a need to use this kind of control knobs to modify shapes (rectangles, ellipses, lines, curves, etc.):

Being able to deform a sphere or line would be terrific if it is possible.