Management of USPS Flat Rate box / envelope usage within shipping settings.
We NEED the ability to filter in/out the stock USPS box / envelope sizes with the USPS plugin. For a store that ships items that cannot be placed in the line of envelopes they offer, we must only use boxes. Think - fragile goods.
Right now, the math is simply done on total volume rather than allowing us to use what makes sense. A simple dropdown selector for the flat rate units you wish to use would fix this perfectly.
Having to turn off flat rate to avoid the issues right now costs us in shipping supplies (our own boxes) and using the code snippet is not a good answer as it is not in the main product update flow and will cause issues down the road.