Quantity based shipping!?!

Hi Putte
Did you ever figure this out? I have a similar need to basically calculate shipping based upon a product quantity. So for example, 1 unit = $1 shipping, 2 units = $2 shipping, 500 units = $500 shipping and so on up to any number of units… What’s really needed is the ability to calculate the shipping amount dynamically upon checkout or manual order entry.
Thanks
Anthony