I don't really want to add that icon there, as it's contextual and most users wouldn't think to look there for something related to copying/pasting. How about in the popup menu when long pressing, I just add a second option which is "Paste to original position" or "Paste to original location"? I could also change the wording for "Paste" to "Paste Here" to be more explicit. I'm open to suggestions on the wording if you think this would be acceptable. This also prevents the need for users to have the layers window up while copying/pasting while still giving them a way to paste to a different copy of a page or a different layer, as you can still select annotations from one layer and paste them in the active layer.
Mike
Mike