Allow addition of an Attention line on the Shopping Cart page.

I am bringing many clients over from another online provider. These customers are primarily using the sites for business card orders. These orders are often for new employees of my client, and most of them ship the product to the name on an eDoc business card at an address from the Locations list. It would be very helpful to have a spot on the Shopping Cart page to add an Attn: line that wouldn't require adding every card holder as a site user. That would make the work load half of what we would need to do with the system as is. Thanks for your consideration.