Ally,
Somewhat OT, but since you bring it up, all those things are good ideas in general:
Par 3's slow play, so you want them as far back as possible in the round,
Returning nines allow about 3000 more rounds per year, so most owners want them
Par 72 - I agree there. Don't know why so many feel par 72 is crucial.
On a world class site, there may be a situation where the gca would be tempted to break the rules. On most sites, I would still go for most of those conventions, because they are pretty good ideas based on experience.