Since the latest upgrade you can choose to display ANY product field including the image thumbnail in your shopping cart, your customer's invoice and your drop shipping notifications.
If you are interested take a look at the "Product Type/Fields" settings in your e-commerce module.
You may also add/remove product fields to and from the product export file.
Contact support@websiteforge.com with questions if you are interested in this feature.
Shane Merem
www.websiteforge.com
Web design and e-commerce