"IIRC diesel engines can idle at very low RPM's so there may be no advantage to shutting them down at stops?"
I realized that, after I posted the comment. Just thinking of all the semis idling at any truck stop should've jogged my memory.
So, maybe instead of computer-programmed shutdown, it would be an automatic, low RPM idle at stop, with shutdown only occurring by the driver turning off the ignition, or putting it in "park?" I'm not seeing something that could work at all with a manual transmission here.