Keep the same delivery date of the order

In this moment the delivery date of a delivery is always equal to the posting date when the order is processed by the warehouse terminal.

Would be nice to have into the extension parameter, a settings to let the system keep the same delivery date of the order.

This can be a good feature for the customer who works with the EDI, where some times the delivery date of the delivery can be interpreted as the date the goods are expected to arrive to the final destination, rather then the date on which the goods have been shipped from the warehouse.