Folks,
I think you will find, if you dig into history, that 1:36 had nothing to do with "safety", and everything to do with the fact that early F27-100 in Australia had 36 seats.
There is nothing sacrosanct about 1:36, and calculations of minimum crew to man any particular aircraft/configuration should be based on thorough risk analysis. Although an "ICAO" number, 1:50 should not be cast in stone, either.
Tootle pip!!