P.P.P.S. The final boss battle revealed: http://youtu.be/U31i-uBVus4
What a great boss battle only... I think there should be one difference.
It would be EVEN BETTER if Bethesda made a tiny subspecies of cliff racers that are difficult to hit, and they always come in swarms of 10. They should all do very low damage, and have very low hp, but they should be able to generate some sonic wave by screaming which paralyzes the player. So the player can feasibly become paralyzed for like 20 seconds while the cliff racers just peck at them, making that wonderful sound... Oh and these cliff racers should be able to sometimes follow you even into caves, and they should be able to swim too. Maybe make miniature zombie cliff racers, that sometimes come back to life a minute later to harass the npc. These new types of cliff racers should have like heat seeking vision or something like that, or maybe even telepathy or even both so that it's impossible to sneak past them.
Ooo and maybe they should be given the ability to unlock doors with key like beaks, so that they can EVEN harass players in their own homes regardless if they leave the door locked or not.