I don't see any fundamental reason why this design could not be master keyed (although it would be more of a pain than with traditional lock designs).
The key spools have a narrow section at the correct position. I see no reason why they could not have multiple narrow sections. The inconvenience is that you would need to stock 10 additional spool types to allow for 2 position opening. (or 6 if key spools are symmetric), and more if you ever need three valid positions for a pin. (These numbers get worse if the system is extended to more than the 5 positions of the prototype).
I'm not sure this is actually all that much more complex, or having more critical precision parts than some of ASSA ABLOY's offerings (like Medeco). The pin-stacks being too tall for standard US cylinder sizes though does seem to be a rather substantial problem.
The key spools have a narrow section at the correct position. I see no reason why they could not have multiple narrow sections. The inconvenience is that you would need to stock 10 additional spool types to allow for 2 position opening. (or 6 if key spools are symmetric), and more if you ever need three valid positions for a pin. (These numbers get worse if the system is extended to more than the 5 positions of the prototype).
I'm not sure this is actually all that much more complex, or having more critical precision parts than some of ASSA ABLOY's offerings (like Medeco). The pin-stacks being too tall for standard US cylinder sizes though does seem to be a rather substantial problem.