Definitely NOT schtick. I honestly do not believe it would have been a new mechanism. I honestly, and not schtickly, believe that where rules are silent, an interpretation needs to be made if a situation arises that necessitates one. I consider this to be such a case. But hey, we're all entitled to our opinions right?
I assume you don't have a rule specifically defining how points are awarded to a kicker who picks up a botched snap on a FG attempt and runs it in for a TD. That doesn't mean your rules are "silent" on this issue. You would award him 6 points, because your league awards 6 points to individuals for rushing TDs. The fact that he usually kicks instead of runs with the ball doesn't matter. It's a rushing TD, and your rules do, in fact, outline how points are awarded for rushing TDs. You also don't have a rule specifically defining how points are awarded to a WR who picks up a fumble on an opponent's kick return and runs it in for a TD. That doesn't mean your rules are "silent" on this issue, either. You award the NE defense 6 points, because your league awards 6 points to the team defense for defensive fumble recovery TDs. It's a defensive TD, and your rules do, in fact, outline how defensive TDs are scored. There's no gap in the rules here that necessitates an alternate interpretation. Next year, if you want to add a scoring rule that awards points to the individual defender in addition to the team defense, that's fine. But that's not the rule you currently have in place, and it's not something you can just add in week 12.