I'm usually a huge defender of what you call "gaming the system" - I don't think it's a loop hole, I think Disney intentionally wants to make a good experience for people with little kids compared to the local theme parks, so that those people with little kids become life long Disney people. But that's for rides when you have a small child who is UNABLE to ride something like RNR or Test Track.
But again, I can't imagine why they are giving out rider swaps on NRJ. There is no height limit. There is nothing scary. It's truly just "hey, we'd like to ride multiple times" I don't get how people are so brazen as to ask for it, and I sure as heck don't get how WDW is giving them out.