We have a cheese store and only like to ship packages on Mondays to make sure they don't sit anywhere over the weekend. We're pretty small and don't always have some one working on Mail orders so we get the occasional complaint when people don't check the terms of service. When the customer is placing an order we would like to force them to pick a shipping date at which point they'll see that only Monday's are available and then have a message telling them that if they want it shipped on a different day to please call the store.
I haven't been able to figure out how to do this, or any extensions that allow it. If any one knows of any that would be helpful.