I've thought a lot about free will and have determined that because what we choose is still what becomes real, even if all choices are pre-determined, a simple 1 out of 3 choice scenario allows for a fair degree of free will, albeit within a framework.
It's like a game - all choices will almost always lead to the end of a story in a game, some games this feels very straightforward, others like we can do anything - none allow actual free will at all.
Reality allows us a lot of free will - as allowed by the rules of course. Choice is significant. We are Watcher Chooser at least - even if it's illusion, it's an evolving illusion dependent on choices we make. Out of all the possible " illusions" we determine what becomes the "real" illusion that is reality. What I didn't do is less real than what I did do .
Free will doesn't actually exist inside of Skyrim and yet there are things within Skyrim only 1% of Players do - reality is much greater than Skyrim.
to;dr: We don't have free will - not really, it's not likely possible but what we have might as well be free will. It's got to be treated that way, we are not just along for a ride, as our ilusory choices create our illusion of reality.