but that's not what I am asking for, am after a simple custom fields added to the product the same way as they can be added to a calendar item using your template field
off the top of my head, some uses
providing uniform structured fields - product types, size, country of origin, condition, etc
audio files, - upload fields, once there can display/play both on the item display and the listings
categories/tags/genres
to me your app would open the use of nexus for ecommerce right up