I did hear back from QR Customer Contact Centre The Americas with very good news, and have now ticketed both the oneworld Middle East Pass and the related international ticket (with the above fare rules) through their office. btw, their service is exemplary.

As correctly predicted by hillrider the language means that there is no USD 100 charge per stopover, that stopovers in Doha are permitted both inbound and outbound, and that stopovers are not limited to 96 hours. In addition, more than 2 stopovers are permitted ("there is no limit" according to the email I received from the Customer Contact Centre).

My ticketed roundtrip international itinerary has 3 stopovers, each in excess of 96 hours, and no additional stopover fees were assessed.

My oneworld Middle East Pass cost USD277 all in (i.e. inclusive of airport taxes and YQ), and is composed of 3 segments (the minimum number allowed), each quoted at USD75 (flights under 300 miles) in economy class. I learned the rules of the ME Pass here

My international business class ticket was very well priced (CMB - JFK RT, IRTEULK), and carries reasonable penalties (USD50 for changes, USD100 for cancellation). Add in unlimited stopovers in both directions and I think that this QR offering could become best in class. I wish that one of our resident TAs would take it upon themselves to become expert in these fares ---- I'm ready to book another!