As it is today, you can charge a shipping fee if the order is heavy or large, but there's no obvious way to add a fee if the customer orders a large amount of products (12 in my specific case).
I thought I was clever by making two hidden shipping options, and checking the right one if the total product quantity exceeded 12, but that didn't do anything.
The only other solution I can think of, is to make sure every product weighs 1kg, and then add a fee if the total weight exceeds 12kg, but I don't like those kind of hacks.
It would be neat if it was possible to add a fee or discount, if the customer ordered a certain amount of items.
