USPS: Domestic Flat Rate Box, Discouted Quotes

Hi, I have a client I moved over from a custom cart and the one sticking point is the shipping. I've installed ZCv1.38a with the updated usps module.

It appears that one issue is that my client is using the Domestic Flat Box Rate if it is cheaper than the quote by weight and zen cart's usps module doesnt offer this as an option. Just curious as to why that might be and if there were any plans to include it in the module, or if anyone was able successfully add it as an option.

The second issue my client mentioned is that they get a discounted rate from usps and want to pass the savings on to their custmers. So I was wondering if there's a way to get the discounted quotes returned to zen carts calculator? Or can they have the listed rate printed on their label so the client doesnt see the discrpency?

Thanks in advance for any help or suggestions.