Yes, I think it's a case of codifying the norms that are already held. Taking care to watch out for verbal overshadowing and similar errors.

The fears expressed by cousin_it and Cayenne are quite reasonable ones to hold, since every cause wants to be a cult. Perhaps take care to facilitate schisms and stay on good terms with them, to avoid the rules ossifying into detached levers and hence lost purposes?

Not that examples spring to mind. Perhaps annual Mixed Rationalist Arts tournaments, to keep a reality check in play.

(Heck, I think that one's a great first step, if we can work out what to compete on.)