Most recipes that use milk powder are cooked as in http://forum.sausagemaking.org/viewtopic.php?t=1953 , where it's used as a substitute for soy protein, as you can see in the recipe it's omitted in the fresh version.
I once tried using Wittdogs recipe but changed the herbs and spices for a Cumberland mix. It didn't work, the Cumberland spice and herbs fought against the smoke flavour