As far as I can see, step-down fixes on GPS approaches are always defined by
a distance to the threshold. Are there exceptions?

Do GPS approaches exist with waypoints (forming part of the approach
sequence) between the FAF and the runway threshold waypoint? Or is it
guaranteed that after passing the FAF, my distance-to-waypoint will always
be the distance to the threshold?

Counter-examples useful. References to publications guaranteeing no
counter-examples even better!

Thanks

Julian