Thank you SO much for getting back to me Dr. Byte!
I don't exactly follow what you were saying, and I think it's probably because I wasn't clear with my question.
My cart is set up so that a user can either use Paypal express checkout (if they have a paypal account) or they go through the regular Zen Cart checkout process, and then they are forwarded onto the Paypal site to give their credit card number and confirm their billing info. That is where the trouble comes in...if they aren't shipping to themselves, the shipping address (say their mother, brother, whoever) is populated in Paypal as the billing info.
You say that Paypal only lets us pass the shipping information. But that is what I am saying is the issue...when my customers go to the Paypal page they need their BILLING info passed so they only have to fill out their credit card info and hit submit. As it stands, they go to the paypal page and the billing address is their mother's, brother's or whoever's address. I'm sure they don't want to try to charge the person whom they are buying the gift for.
here is another post from a person who is having the same issue, maybe he explains it better then myself:
http://www.zen-cart.com/forum/showthread.php?t=125948
Thank you for your time!