Rules are always divided into "letter of the rules" and "intent of the rules". Races can only go by the letter, because we rarely have any insight into intent when the rules are written.
Just add "timing rings may be modified to increase timing adjustment available".
Done.
Or don't allow ANY modifications to a stock ROAR approved motor. Then each motor will have to stand on its own merit, warts and all.
Thanks for putting up with us, RobK.
Mark