Wouldn't the features offered by a pipe organ control system be largely redundant for a Hauptwerk setup? The Peterson system could stand in for HW's combination system for example, but what would be gained? I could see the Peterson system becoming useful for a builder of a hybrid organ where the Peterson system would include options to control swell shades and I suppose a host of similar "real" items. Similar functions for HW might involve some custom programming to implement.
One of the pleasant surprises with my recent drawknob console MIDI conversion was the realization that I did not need to store any information about the "state" of any of the controls except whether the actual switch for a key or piston or stop was currently on or off, and that stateful info was only needed for debouncing the contacts.
As I glanced through the ICS-4000 brochure kept seeing features that I already had with the Hauptwerk software.