How can we pass in a unique identifier to each created product in an order. We need to be able to identify the order the product came from for re-order. 

Best would be a text element that has the ID or code passed to it after the product is ordered.

Are comments ever added to these threads?

Sorry there seems to have been a little mistake. I think this was meant to be a feature request. Please add it to the feature request forum, formulated as a request not a question (I think it got moved here because of that).