Change address used with automatic account setup

Yes I have read around the forum, and understand the error with different billing/shipping addresses is PayPal's fault.....

That being said....

How can I switch the automatic account creation to use the billing address to create the account automatically instead of it using the shipping address? Chances are, if they are different, the customer lives at the billing one, not the shipping one. If I go in and manually change each one, there is no problems from PayPal on subsequent orders. But it is a hassle to go back in all the time when my Zen Cart store already has the correct one somewhere (it tells me it in the order that it used to make the account in the first place.)

Thanks,

Will