Customer Invoice Due Date + Pay Term Base Date don't match

A user may create a customer order and not completed the creation/printing of the customer invoice a few days later. This results in the Invoice Date and Payment Term Base Date on the invoicing not matching each other. Therefore, when compared to the Invoice Date, the due date is earlier than desired (as the due date is calculated from the Payment Term Base Date).

Is there a way to either;

1. Have the Due Date of an invoice calculated from the Invoice Date
2. Prompt a user that the Invoice Date and Payment Term Due Date do not match before the set the invoice to PostedAuth.