Minimum Ship Date

I have a scenario where we perform capable to promise ATP. We have found that if there is inventory of the item available at the order creation. It assumes I can ship it immediately and makes the ship date the next available ship date.  Is there a setting to make the order get an earliest ship date of 4 days into the future? In other words, even if I have inventory, I need a few days to process the order, and prepare it for shipping.