The due date is intended as an information field to help you manage your activities. The due date appears in the Activities list. You can use this field in queries and views to display overdue messages. The e-mail message is not sent automatically on this date.
We have a specific page on our Web site for customers and partners to make suggestions for future features/product updates.
Please go to the following page (http://www.microsoft.com/Businesssolutions/Community/Newsgroups/dgbrowser/en-us/wizard.mspx?dg=microsoft.public.crm&lang=en&cr=US&type=suggestion) and either add to or vote for this suggestion to be sure our product planning team has this information to consider for future releases.
There are several Microsoft Partner and third-party solutions for Microsoft Dynamics CRM available for common customer feature requests. To search for available solutions and partners, click the link below to search for Microsoft Partner solutions designed for Dynamics and Microsoft Business Solutions products.