That potentially could work but the issue is that the 2 copies are different: the printed copy is used as the Packing List (with conditionally suppressed data based on the Shadow Text), and the .pdf copy is the Invoice. In 3.71 they hadn't been able to adequately take advantage of Shipping Data Entry (SDE), but the plan is to do that in v2013. Then they'll be able to print the Packing List from SDE, and e-mail the invoice from Invoice Printing.