Please make sure there are ways (either automated or manual) to ensure that design placements on the multiple products all look good. Today's "automatic product creation" often crams designs up against the very edge of the product images, and sometimes even shows parts of the designs hanging off in empty space past the edge of the product! This looks terrible and unprofessional and is a turn-off to potential customers.

Correct those problems, and this will be a very nice feature. It looks very promising!