The type of usage you are suggesting should be added would seemingly make copyright law in non-commercial arenas non-existent, which is clearly not the intent of fair use.
I suggested what that would have that effect? The only thing I intentionally suggested was that PDF's be shared in as similar a fashion as you would a book. Other than that all I remember saying is that I don't see how to interpret it the same way you say to. You say it is a very specific and short list, I have been saying I see it as a "suggested" list, or "examples", that can be further expanded upon as needed due to future court cases give further definition to what "fair use" is or is not.
If I were to ever publish something I would definitely do it with much more legal advice than I have now.
As for "fair use" I think sharing PDF's like I was told is a pretty safe way to share a PDF and stay within "fair use". The ways I know it has been done, sharing copies while still having one yourself, would definitely be risking legal action.
So if I ever share a PDF, I will not have a copy of it on my computers while it is out on loan. If I ever borrow a PDF you can rest assured I will save the e-mail with the PDF link to prove I returned the borrowed PDF, and they will see I no longer had a copy of it after that date.
That was the guidance I received, it makes sense, and I think it will protect me adequately under "fair use" that no one will be able to accuse me of willful copyright violations.
That was the purpose with which I started this thread, and I think I have found sound guidance on how to fairly share PDF's.
If you as a publisher would have a problem with me sharing PDF's in this manner please let me know why. Since it mimics sharing of hard copy books as closely as possible I would definitely like to know any "holes" you see in it.