How to increase shipping cost by 50% for quantity >1

Hello!

Does anyone know if the default free woocommerce plugin can implement the following scenario?

If qty > 1 then add 0.5 of the shipping cost to the current shipping total

Or do I need the Table Rate (or some other) plugin to achieve this?

Sample products available in the demo store at http://aftradvillage.com/2013/shop/paintings-gallery

Thank you.

http://wordpress.org/extend/plugins/woocommerce/