I've never heard of a load on an anchor as a "shock force" before. There's only one force involved, and that's from the climber's mass accelerating. The only variable is the time over which the force is applied to the anchor. Force/Time is controlled by the amount of elastic response in the rope system, which is directly related to fall factor.
Also, if I understand the ferrata stuff correctly, the carabiner is subjected to some horrific torsional forces when falling on a ladder like that. The point still seems to be valid though.