Revision 9321 does two things: the item is Generic, and if you went to the trouble of buying one in Valhalla, it will steal and equip it whenever you swap familiars, in preference to other Generic equipment you might have.
If you mean parsing "Familiar: xxx" or "Familiar: any" from the item description and adding Generic if the latter (and perhaps writing a familiar override for the former, if we know about the familiar already), then yes: please write a Feature Request.