Feature Request to add additional Amazon Shipping override fields

We constantly use the shipping override template because we find that the shipping weight for most products is not correct on Amazon and so our pre-configured shipping rates do not work. I can list a 4 oz item to Amazon but someone may have previously listed it as a 4 pound item. 

We only sell domestically so we use the following zones

Std US Prot Street Addr

Std US Prot PO Box

Std Cont US Street Addr

Std Cont US PO Box

Std Alaska Hawaii PO Box

Std Alaska Hawaii Street Addr

If their is a work around, I would be interested to hear it.

Thanks