Looking for something similar to how CRM or Salesforce works without having to purchase another app. For instance on the "shipping" screen when you have the check box to let the customer know. Why not have another box with a calendar feature and a note to follow up with that customer.
All too many times you have a customer who is a raw new customer and they order, you make and ship, but yet they are lost in translation. A simple follow up reminder could have gained extra revenue, or at least help foster a relationship.
This feature could also be coded in the customers file too somewhere, but with that added feature inside the shipping window.