Hello Russel and Ricardo,
Many thanks for your interest in our plugin.
As I replied you via skype, the images can be exported in CMYK & 300 DPI, but there is a server requirement: the server supports Php Imagick.
Also, you can create template so that the clients can make a quick edit, kindly refer our demo at:
http://demo2.cmsmart.net/web2print/create-your-own/?product_id=84
In case you don't know how to make it, you can create a ticket to get support from our Dev team.
If you guys have any questions, feel free to let me know here.

Best regards,
Vincent

I will also need to know if this is possible