what do you mean first person finishers? do you mean the finishing move the avatar does when he kills a dragon by jumping on its head, that kind of thing?... then the answer is no its a set piece of predefined moves by both avatar and camera...
you may be able to get a mod that will allow you to have full cam control but i think you will have to request it b4 you can download and use it because i dont think such a mod exists yet.
but check out the skyrim nexus to be sure...