See this well-written and useful guide:-
http://forums.dpreview.com/forums/read.asp?forum=1036&message=37790179
P.S. 1: The offered features and operations are applicable to the latest Metz firmware update and versions for Metz Pentax flashes dated Feb. 16.
P.S. 2: "Servo" flash mode of the Metz is actually the Slave flash mode as it is normally called and referred to. This is just a Metz specific term, I think.