Don't know how practical that would be for gameplay in sins
its not for gameplay? its for when you just want to sit back and watch, or make a video.
there have been a bunch of times where i was watching a battle and thought, you know, this would be a great game to make a movie with (considering my laptop is pretty powerful all the graphics etc are maxed so it looks delicious =P)
except i never had the patience to do good camera work, and i really didnt know what to film and where etc (i do that alot, think, man it would be cool to make a mod.. except i dont know how =P)
so my vote definitly goes towards this. maybe have some AI that knows when something interesting is happening like a cleansing brilliance or missile barrage or novalith strike or a cap ship explodes etc, so it could change the camera angle and you can film/watch it.
i mean, how bad would you feel if you were here zoomed in on a little LF watching him fly around, and behind you the battle of the titans is going on with cap ships blowing up and beams of hot white light are punching wholes through ships... youd be like D'OH!