thanks for the feedback guys!
I don't actually have a K-car at the moment but ran a B44 this season and being from the old skool, grew up with 4wd having one-ways. There's not one available for the B44 and I'm not really sure that I like the way it drives (but don't know if thats the car or a symptom of the full-time 4wd).
So I'm investigating potential alternatives...