Almost every time I'm preparing a contract, I forget to indicate a due date. The reason is, because it's on the Payments and Adjustments tab.
It makes much more sense for it to be on the G&S tab.
Also, this date should be required before printing the SFG.
Another thought I had....the date should always be equal or greater to the printing date, or throw an error AKA, due date should not be less than today.