Namedserverfilter supports list-type targets if all elements are servers, e.g. "target02=myserver1,myserver2". A target with server type tags cannot be a list, that is, "target02=myserver1,->master" is not supported. This should be added, as it would allow easy prioritizing. Such a hint would be interpreted as "router to myserver1 first but if it is down, router to the master, otherwise fail".