Hey man, I really want a 3rd too. I think it adds "immersive" value to the game experience and the character models are just awesome to look at. I think it would be nice in jumping parts and make more melee options in the future maybe. I think the third person in the tower and for things like sword wielding are really smooth already and would feel just fine. I would say make it right joy-click accessible like many other games. I don't know of any games that had it switch between when aiming though. Usually it stays in 3rd to aim as well.
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It shouldn't switch like you said. Someone above mentioned Mass Effect, they could use that or Lost Planet (1 or 2) as a template with their already implemented systems. Aiming would simply focus in slightly while giving you the associated benefits, snipers would go into scope mode (as in no different than it is now).