Also just to throw some more confusion into the discussion...you can convert the FW/FG hubs to 5 speed, they will work just like the S5. Using the standard 3 speed click shifter and a friction on the left side. I haven't done the conversion myself, but know a couple of people that have. I have an FG that is going to get the conversion because it doesn't have the 2 part indicator rod and they are hard to find and expensive when you do.
Aaron