Ok, so with help from my good friend Carrie @ BCS - here is how it works:
You must edit auth.php - add these lines in at the end before the ?>
$user_wishlist_only=array_pop(func_query_first("se lect wishlist_only from $sql_tbl[customers] where login='$login'"));
$smarty->assign("user_wishlist_only",$user_wishlist_only);
Then, in most templates, this variable will work to pull customer info:
{$user_b_address} for example.
Cheers

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Instinctual
Colorado
X-Cart Versions 3.5.x - 4.0.4