Actually such a feature would be very helpful, although there are more pressing issues i guess. I also have to keep extra clean copies of each (of thousands of) research articles so I can share them with colleagues so they don’t get my annotated files. It is often difficult to obtain articles that require subscriptions that your university does not have. So we have to share a lot. This keeping of extra copies is a pain because most of the pdfs are never shared. If I remember correctly, such a feature was implemented in Bookends. I could imagine an option (in Preferences) that saves a clean copy of a pdf as soon as I start annotating it, and then i could retrieve/share that clean copy from the context menu.
Let me describe a typical situation: I skype with a colleague and we talk about topics or literature, and, simultaneously, I search in DT. Then I get a couple of good hits (pdfs). Now I want to send them over to my colleague, but without annotations. Currently, that’s difficult: I have to manually retrieve each of those pdfs from my store of clean copies. That store is alphabetically organized, so it might take 10 minutes to find them all. In an ideal (DT-)world, I would just mark them and select a command “share clean copy”
have a nice day