There are just ideas, take them as you will:
I'll start with the 1.5 Epic Quest:
If you have not spoken with Gondon and received your flag to embark on the quest, Fangor the wise should respond to a hail with 'You must go speak to Gondon in The Hidden Forest foolish <race>.'
If there is any way to code and increase Fangor The Wise's hail response range I'm sure that would be greatly appreciated by many.
Epic 2.0 Quest:
If you have not done the Dragon Sages quest when you try to give the material to you know who in Icewell keep. He should respond with, 'What are you trying to do? You must complete The Dragon Sage's task.'
Dentor in Sleeper's Tomb:
Possible to change him to a regular quest mob and not a hail, whack you're dead type deal? Its a cool looking model so of course people are going to hail him.