In the Paint Editor, the dox for Draw/Stroke Method/Curve don't mention the use of CTRL+RightCLK to initiate drawing of the curve.
The also erroneously mention the use of CTRL+LeftCLK to add additional control points to a curve, to whit:
**Add Points Ctrl-LMB You can define additional curve control points by using Ctrl-LMB. The handles can define by dragging the mouse before releasing the mouse button.**
The correct action is CTRL+RCLK, again.
Also missing is the workflow to determine the location of newly created control points on the curve: it's "after" (in curve-creation terms) the selected control point, UNLESS the user selects the first point, in which case a new 'first' point is created.