That's great news.

Those additional options are available in this addon USPS module
The module also has the Commercial, Regional flatrate box shipping calculations.

Also included are optional weight or volume filtering for the flatrate boxes, insurance calculations, delivery/signature options.

Option to sort the options presented to the customer from lowest to highest instead of the default order.

Volume filtering requires a small database mod and a change in product weight formatting to use decimal places 6-10 to store the product volume. It's been working nicely for us to remove shipping options presented to the customer if their order will not fit within the smaller boxes.