Hmmmm...we must have just lucked out. I know it was one of the last meals (possibly *the* last) we ate at Pop that week and my 6 yo started to get upset when she heard her older brother and sister (both Disney "adults") tell the cashier that they were having ice cream sundaes for dessert. Maybe the cashier was feeling generous or just trying to spread some magic, but she looked at me and said, "If she doesn't want the dessert that comes with her meal, she can pick any other dessert and I'll put the pudding back." So she had an ice cream sundae that night. I guess I just assumed that it was ok to make that substitution any time -- at least at Pop. We learned very quickly that there don't seem to be any hard and fast rules with the QSDP -- some locations allowed substitutions and others didn't. If someone wasn't happy with the standard options on the menu, we always asked what could be substituted and I would say that 90% of the time we were given several options for substitutions but that other 10% were flat out "no substitutions" (usually when asking if we could substitute a bottled drink for a dessert since we aren't big dessert eaters). I really think it depends on the CM and how the stars are aligning that day/night. It never hurts to ask.