Creating manual sorts is pretty futile. It means every time you add a new book you have to place it in your manual sort. If you are going to do that, you might as well just use a custom column for it.
As for adding books to a virtual library, simply create a tag name "myvl" then create a virtual library that searches for books with that tag. Now you can simply drag and drop books onto that tag in the tag browser to add them to the virtual library.
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