What do you mean by that?
The idea I had was to use the tool to select a set of polygons to be copied. The you could select polygons on the same mesh, or other mesh, to paste the copied polygons to. But I would go further, and allow to "store" more than one source. You could copy and store up to 5 sources, and paste any of them on any mesh. I wouldn't go futher than this, otherwise I would just be copying the PolyGnome plugin.
This PolyDup plugin (while using the idea behind PolyGnome) is just meant to quickly select polygons and copy them. So, the user wouldn't have to bother with the steps to create assets (or presets) from these selected polygons. Just select polygons, use the tool to indicate these are the source, select other polygons and indicate these are the targets ... and the source gets copied to the targets.