If you use the add to cart interface and mark it as "updatable" from a "list", then the list will be blank at first. But then you can highlight the list and use the native DW list properties to set the values.
If you want you can also just add the list to the add to cart form and name it yourself and populate it using standard Dreamweaver form functionality. Then in the eCart add to cart button, don't check the updatable checkbox and use the lightning bolt to set the value from the list form element you added.