Would it be possible to add a customizable part number field, that could be passed on to checkout? Could be useful for tracking.
I would like to be able to add it on the "Add Product/Subscription" page. Then I could make identical products - with different part numbers. I could make seperate signup pages for each part number, to be used to track individual keywords in google adwords. Or - I would like to be able to do something similar to what clickbank does, with the tracking TID number http://www.clickbank.com/hoplink_faq.html#hoplink_question_3