Perhaps it was a selling point, like purchase a piece of property and have the opportunity to make the rules by which you'll live.

I doubt it. More likely is the subdivision process. Boise recorded the documents for each new section as a separate subdivision (section) within the overall subdivision of OPA. So long as Boise had control they simply used the same DRs for each section as it was added. Regardless, it is a rather moot point now.