Does the Voith website still have the great simulator? If I remember right, there was a really spiffy animation of the system that showed you how you steered the boat by using a joystick. I don't know much about shipping, but I do know that the double-ended Halifax to Dartmouth ferries here in Nova Scotia have Voith-Schneider propulsion. They can sail in any direction, including sideways. When they reach the dock , they keep the props turning to force the boat against the side and end of the dock. That way they never have to tie them up and the turn around time is just a couple of minutes.
way, way off topic for this thread, by my plan a few years back was to see if the VS system could be applied to a vertical-axis wind turbine. I drew up a complete 12" = 1 foot prototype on AutoCAD but never got the chance to make it.