Yep, we are non FARS but the rules sound similar, i.e. only a percentage of the passengers assumed to remain on O2 once the initial descent is complete, but all crew until at or below 10k.
We work on the worse case of engine out only, depress only and engine out combined with depressurisation to come up with ETPS and "range circles". Since we don't use gear for rapid descents that option isn't planned.
Rgds.