From within your folder, is it possible to make a non-reusable copy of a reusable...

Yes, by dragging the reusable object into your mapping and unchecklng the Reusable checkbox

Yes' by first clicking the Ctrl key and then dragging the reusable object into the mapping

Yes, by first selecting the reusable object and while dragging the object into your mapping, hold the Ctrl key down

No