Its a great idea IMO cz then I can list if I loaned any items from anyone and i can remember easily to give em back.And also the ev spread as you said, might also help with breeding hp then you can list the odd/even ivs.
So overall its a great idea i'd say and I hope the devs think it the same way if there are any problems with it i'll be glad to know.
Thanks
~Qaviul