Marketpress More Shipping Fields

Is there a way to create more shipping fields when user is creating a NEW PRODUCT?

It has one shipping field now.
I'd like an additional field for international shipping on that page that the user can input how much shipping their item would be and then the purchaser can select which option they are. If they are international and so on... Maybe this is already sorted somehow and I'm not aware of it? Or a plugin?

Please advise. Thank you.