Bish, this is definitely possible, I have seen it before with other servers, just requires a camera instead of a view of the player...hard to describe. But there is a way to do it, I do not code so I don't know how, but based on experience with many other servers over the years I know it is.
Also I fully support this, annoying how when I am in my hummer's passenger seat I cannot see anything, and that's just the hummer. I know TDM will replace most vehicles but depending where the seats are it will still be hard to see from them. Plus if they cannot see third person the driver shouldn't either, gives them an advantage. And advantage I mean by being able to view a lot more.