Shipping cost by product variation

Can different product variations have different shipping costs associated, or perhaps some have an add-on shipping cost? I’d like to do this:

[wp_cart:Kitten Print:price:[Framing|Unframed,10.00|Framed,15.00]:shipping:Unframed:[Shipping|Mail,3.00|Courier,15.00]:shipping:Framed:[Shipping|Mail,5.00|Courier,20.00]:end]

Or maybe simpler to make each shipping cost a list, 1 for each variation, thus:

[wp_cart:Kitten Print:price:[Framing|Unframed,10.00|Framed,15.00]:shipping:[Shipping|Mail,3.00,5:00|Courier,15.00,20.00]:end]

http://wordpress.org/extend/plugins/wp-ultra-simple-paypal-shopping-cart/