With version 1.8 (r7700), if I add WIKIPRINT_BOOK permission to a user, he does not see wikiprint at all in the admin screen. If I add WIKIPRINT_ADMIN, then both options and make book sections are displayed. I even tried restarting Apache between each permission change, and I can't get WIKIPRINT_BOOK to do anything. Users without WIKIPRINT_BOOK can make "single page books" by downloading alternative formats on wiki page, so I assume that I haven't misinterpreted the feature. I also tried setting via trac-admin as well as web interface to make sure I spelled it right.