Better PDF creation would be a great addition to this plugin.
If it is to be taken seriously by the print industry, then the PDFs that are exported really need to have fonts embedded.
The whole point of an online designer is that it saves the Printer/Webstore owner time. If they have to recreate a product from scratch to send to print then its not really saving time.
Not a criticism, just my view as to where the plugin is lacking.
Overall a very, very good piece of software.