The rule which requires offering a 24 hour "courtesy hold" isn't proposed, it's a rule. I don't think that particular rule is effective. I'm not sure if he effective date is 10/11 or 1/12.
The effective date is January 24, 2012. While you're technically correct that the rule already exists, I referred to it as a proposal because (1) by its own terms it is not yet in effect, and (2) Allegiant Air and Spirit Airlines have sued to prevent it taking effect (the case is pending).
I'm pretty sure the PP is incorrect with regards to Maine. I don't think price adjustments are required by law.
As previously noted, it doesn't matter what the law is in Maine. Airline pricing is governed exclusively by federal law.