"None" option missing. Book Manager forces user to create a new book anytime content is saved.

Further Information:

Use of the module on the sponsor's website gives the permissions for the example's use of Book Manager to use permissions seen in the below screenshot.

http://www.funnymonkey.com/files/book_perms.png

This permissions setup allows users to see and add content to other user's books, and global books. If you don't want users to be able to add content to global books or other user's books, you would uncheck "add content to book" in the Book Module?

If you do uncheck "add content to book" in the book module, then the user is forced to create a new book or ad the node to an existing book, by book module every time they create content which is of a type that can be added to a book. There is not even a "none" option.