The FedEx guys at Stewart were nickeled and dimed by the NTSB on such technicalities as not calling out the formal name of the emergency evacuation checklist. From the Flight Safety Foundation report in the link posted earlier:
"...Finally, the CVR transcript indicates that the captain did not call for an emergency evacuation. (After the captain said, ‘We need to get [the ***k] out of here,’ the flight engineer said, ‘Emergency ground egress.’)"
However, the FedEx captain's persistance in getting the aircraft on the ground quickly saved the crew, even if they missed some checklist items. In the old days, i.e. a decade ago, we would often go into holding in the sim to complete lengthy fire of unknown origin checklists. Now the drill is do as much as you can on the way down and land ASAP.
ETOPS does address fire detection and surpression, don't know if this includes cargo planes. As mentioned, the DC-8 is not ETOPS anyway and is perhaps grandfathered under some old certification rules from the 1960's. This PHL incident would have been a nightmare at 30 West or NIPPI.