What's wrong with F2, its does the same as what Windows does - opens the file name for editing.
One of the reasons I use a 3rd party file manager for Windows is that it has a tweak to disable single click rename - drives me nuts when I have to use Windows/File Explorer.
IMO if one wanted the Book browser behave more like most (all ?) file managers the first thing to do would be to make it keyboard focusable/navigable. Qt permitting of course
BR