I know this would never, ever, ever happen... but my suggestion to RunDisney would be that all runners must submit POT for a non-rD race that they have completed. This would prove that they are able to complete the race distance within the required time, and (hopefully) they are aware of proper course etiquette.
I've participated in several non-rD half and full marathons, and course etiquette is never perfect, but it's usually better than at rD races. RunDisney races are definitely a fun experience, and I want to continue to run in them, but I wish that runners were more aware of their surroundings.
One of my friends was swept recently at the
Disneyland half due to an injury. We were talking about her experience being swept, and we both agreed that if a runner trains really hard and does their best and still gets swept, it could be a devastating experience. Showing proof of completing an equivalent race distance might prevent that negative experience.