You can Mark books when they are added, there's a setting in Add Books. After adding a "boatload of books", show all Marked books and do what Kovid suggests.
The Marks (push pins on left edge of book list) don't persist, i.e. they will disappear on exit, restart, or a library switch. You may need to add the Mark Books tool to a toolbar/menu, there are kb shortcuts too.
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