A very basic feature such as copying a shape is missing in the PowerPoint APIs. The closes we get (in my understanding) is the general Office API getSelectedDataAsync(Office.CoercionType.XmlSvg). Fir...
The copy shape feature would unlock a vast number of scenarios for add-ins. I'm working on a add-in where this feature is needed and there are no workarounds available. The scenario is basically to copy shapes from one part of a presentation to another slide and repeat the shape(s) and as a next step change some properties of the new shapes, such as text.