1. It would be handy to get a good error message indicating the error and a suggestion how to solve it instead of a general non-informative failure message. Actually, I think that the omission of good error messages is u bug and should be adjusted as soon as possible.

2. Being able to provide self defined unique keys would be nice.

3. Import/export to/from Excel or Access would be much appreciated.

4. Adding a counter for number of items in stock, that is dynamically adjusted with orders, temporarily when the sutomer is in the ordering proces and with treshold triggers (e-mail messages) when stock is getting low.