From this page you can refine the functions a member or librarian may perform
Superlibrarian - Access to all librarian functions (Librarian)
Circulate - Circulate books (Librarian - Issue and Return)
Catalogue - View Catalogue (Librarian Interface)
Parameters - Set Koha system paramters (Librarian)
Borrowers - Add or modify borrowers (Librarian)
Permissions - Set user permissions (Librarian - this page)
Reserveforothers - Reserve books for patrons (Librarian)
Borrow - Borrow books (Librarian and Patron - by default this is available)
Reserveforself - Reserve books for self (Librarian and Patron)
Editcatalogue - Edit Catalogue (Librarian - Modify bibliographic/holdings data)
Updatecharges - Update borrower charges (Librarian)
Acquisition - Acquisition and/or suggestion management (Librarian)
Management - Set library management parameters (Librarian)
Tools - Use tools (Librarian - export, import, barcodes)
Order - Place orders in acquisitions (Librarian - can place orders in acquistions but not receive them)
Receive - Receive orders in acquisitions (Librarian)