Override of Contact/Phone/Fax numbers

To all,
One of my customers does a great deal of "Drop Shipping" to their customer's 
customers (Internet distributors).  When the order is entered, they are 
currently putting the end customer's phone number in the address lines since XA 
does not keep the override Contact/Phone/Fax numbers.  They need the phone 
number/name in the event they need to contact the end user.  I have suggested 
using Order comments. Does anyone have a similar issue and how have you solved 
it?

Thanks...
Eric