Mrprez, those rules are still good. Like you I am not sure where mayday got his info.
Not sure why people thought you couldn't hammock in the Smokies. I have and I know other folks who have been hammocking in the Smokies for yrs. Too many great places to camp in the park other than the shelters.
If you are at a shelter and it is full you can hang outside of the shelter. IMO you shouldn't hang in a shelter anyway. It is just as bad as someone who decides to put a tent up in a shelter.