I've updated the attachment in post #1 to include the missing `Search in library by default` patch, and include it here for those who want to paste it into their current libnickel.so.1.0.0.patch file:
There are now 5 search location options available when you tap the search bar: Bookstore, Library, Current Read, Annotations, and Dictionary. Which one comes up by default depends on where you were when you invoked search.
The patch should cause Library to be the default whenever Bookstore would have been the default without the patch, but have no effect if another location is the default. I.e. if you invoke search from within a book it should still default to Current Read.