Unfortunately the configuration you set will not be appropriate for other scenarios since some of the settings you used take effect outside of the shipping module. Those settings in Configuration->Shipping take effect in the shipping class which is part of the zen-cart core. It works at a higher level than the usps shipping module.
I am hoping at some point in the future to upgrade my module with some of this functionality. At the moment it's just me doing the work periodically in my free time.
The functionality you need for the flat rate boxes isn't built into my module at the moment.
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