I wish to suggest some development for your Eagle soft. Many companies use internal part number for part in their plants. At the moment I have not seen any option in attribute settings which coould be used for it. Also, part attributes are not included into part list. It could be really helpfull for designers who generating part list for factories from schematic if the "part number" or "part attributes" options would be available in partlist.
Kind Regards,
Piotr