Further research on FT, searching for the phrase "OFFICIAL QR HOLIDAY STOPOVER", led me to
http://www.flyertalk.com/forum/qatar-airways-privilege-club/1657254-qr-fare-rule-question.html ("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" -- meaning all the restrictions detailed in Stopovers are waived)
I still can't figure out how I book this or get the benefit of these fee waivers and rule waivers.