@Xara, in removing the Registered SmartShape entries access, could you actually deliver SmartStraightArbritraryShape?
It is a simple utility that works as a 2-point straight line and a 3-point triangle.

It is fun making it go wrong with a Art Line and a Contour.

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If anyone wants to access the Registered SmartShapes, Customise key shortcuts and associate Shift+Ctrl+, to the Registered SmartShapes... entry.
This works as far back as XDPX v15, which has a far nicer interface, by the way.

Acorn