* Path->Create Circle... -> Number of Sections:
* Path->Create Arc... -> Arc params:
* PathManipulator->Context Menu->
	* Transform (creates TransformBox)
	* Cut
	* Copy
	* Paste (replacing first selected points, or appended at end)
	* Soften (available at hard edge(s),
			  inserts points for round corner,
			  asks for radius)