I'm not sure whether it is possible or not but how about making the following compromise: Rather than make people rerecord those games where they used the multimillion bonus in order to compete with others that had used it, why not accept those recording but with their final score being their end score MINUS the multimillion bonuses.(posted 9136 days ago)It would be irritating to lose a good recording that was only flawed because the multimillion trick was used - especially since it wasn't explicitly stated in the rules that you couldn't use the trick in the first place.
This is one of those unfortunate situations where it seems unfair to change the rules mid competition where it is clear if we knew of the trick beforehand it would have definitely been banned.