@dax702 - I responded to this point a few weeks back...
@dax702 - I believe this will have no effect on our code as we request the rates, either standard or commercial via their API.
Just to add to this...
No PRICES are hard coded in our extension/plugin.
The extension sends a request to the API and the API (USPS) will then send back the rates. No changes are required for this.
From what I can see from your comments is that the real issue is how the calculations are occurring rather than the actual rates themselves. I do agree that this is the important part for the plugin to get it right (or close to). I feel our extension does a very good job at it. We have invested a lot of time into our shipping framework and also a new service for intelligent packaging, called Cubica.
Just remember, there are limitations for all shipping services, including USPS - i.e weight, size (dimensions), girth etc.