Josh, in my eyes that covers it, I guess at the end of the day when your on the parks property there in charge so to say, rules like this have been around on Fungle and Carousel before, and are enforced if the staff think its needed to do so.
Because its the "people like you" (not you! ) who ride the ride, mess around causing problems, rides are very dangerous, even more so rides like rumba rapids, people messing around could very easily cause serious injury on the ride, for that reason they have decided they need to limit it for the time being for the safety of all who ride.
To add to that , when I rode yesterday there are new signs up reminding people to remain seated and those who dont will be ejected from the park, I'm guessing somthing must of happened.