Staff use the catalog to pull materials for displays and storytimes, and sorting by author or title doesn't do them any good when looking in Non-Fiction, or when looking across multiple collections. For example, if they were looking for display items for Dragons they are going to be possibly in a few different Dewey numbers as well as in all the subsets of fiction, so running a search and being able to sort by call number would help them find the items as efficiently as possible.