I do still have it and I have been using it quite a bit, but I haven't tried to publish it on the Autodesk App Store since Windows 10 came along.
The app has developed a couple of quirks over the last 3 or 4 versions of Revit (or maybe they have always been there - I'm not sure).
The quirks have nothing to do with overriding the "phase" or "workset" of the pasted element. That is easy - and its not really any different than changing the phase or workset of any element that has been placed in the model.
Oddly enough, its the "paste" that gives the most difficulty. When you paste to a new host, you get a warning, and the element always winds up "unhosted". So I have typically been using a two step process - run the program to paste elements, and then re-host elements. Not ideal, but it still seems easier than having to change views.
I planned on trying to get it to work a little better. I've also just recently noticed it seems to have a problem pasting elements into some plan regions. I need to look into that a little more also.
I'll try to find a way to make it available again. But I can almost guarantee it won't be a "Digitally signed" app due to the expense of getting that.
https://knowledge.autodesk.com/support/revit-products/getting-started/caas/CloudHelp/cloudhelp/2017/...