I want to provide a floating button (not inside the navbar of FlipBook3D) which enables the user to directly open the search modal. Is it possible to "hijack" or call the appropriate function?
Yes, see the search template: 3d-flip-book/templates/search-book-view.html, 3d-flip-book/css/search-book-view.css, 3d-flip-book/js/search-book-view.js
Thanks very much for the hint, will look into those files and adapt my modified templates. Great plugin btw, thanks very much! (customer of mine purchased it 2 days ago)