In the latest version, "service-time 0", "queue-length 0" and "round-robin 0 " are possible value of path_selector. However, in code of yast2-multipath only "none" and "round-robin 0" is valid. The code need to be updated as the new multipath version. Beside path_selector, handler for some keys is not implemented yet. eg. detect_prio, bindings_file...