Before I started using Auctiva I am pretty sure Paypal would automatically transfer the weight I had entered for the calculator. Since I started using Auctiva the shipping info has been transfered to paypal shipping on a very small percentage of my auctions.
On a side note - I have started to use paypals multi order shipping. You input a range and not an exact weight (unless it's First Class.
The shipping info has never transferred over to the multi order shipping.
Thanks
Katie