Add Actual Ship Date to Shipments Process

Currently, the ship date defaults to the current date when the order is marked as shipped.  Often, labels are printed in advance with a future ship date or orders are marked shipped after the fact.  There does not appear to be any way to override or enter a date of the actual shipment.  Please give us a field to override the current date default manually when the shipment date is NOT the current date.

Please let me know if I'm missing something, but I just don't see a date anywhere on the shipments screen.