I will step up and be Xeno's
I love that someone is finally taking about Nietzsche! His Eternal Return is an intense philosophy, arguably the grounds on which his Zarathustrian Übermench stands, but it's important to measure a man's theory by the way he lived, and ultimately his fate. His last letters resemble a man who has seen more than his model of reality would allow. He was stern in his truth and his firmness broke him.
I believe Nietzsche was too grounded by his philosiphy and therefore uprooted when enlightened cosmic mumbo-jumbo came his way. He believed firmly that this material world was all that was, that doctrine that makes man hope for more outside of it was
poison! So when he began seeing seeing and knowing the impossible... the lunatic drowns in the waters a mystic swims.
To get right down to your question, I give a very glad
yes 
The world is magic, like a pool table where the white ball's been struck, physics already knows where the balls will fall before they land there, time just has to catch up. As it is with folk who sleep in a reactive life, toss something their way and what happens is already predetermined based on their programming, like a billiard ball's programmed to react certain was when struck.
Freedom, though, that comes from the Will you've mentioned, sorta like the Will-to-Power. Since everything is magic, that makes
you magic as well! The you that is conditioned and reacts predictably is just another billiard ball... but what if you didn't care about what others do? What if you have your own agenda that wasn't determined by past events or your emotional programming and disregard your natural impulses, your surroundings? You can argue, yes, that you decided to rebel based on your experiences before, making your actions just a predetermined, but the path you choose, if made from a place without logic or emotion, can't be determined, only estimated by percentage.
The idea of cause and effect falls apart in an animistic model of the universe, but let's stay mechanical for the pool table metaphor cause it's fun. Where does meditation place you in the great machine of cause & effect? You come to a point of complete stillness, where nothing is effecting you and you are causing nothing... I argue that it is in that silence that true will exists! Free from all pressures, impulses, desires, you can decide to do something completely new, to make a cause birthed by no effect, in an effectless still bubble of consciousness, a
halo of stillness
To become this "causal entity" is to be awake in a sleepy, reactive world, to become conscious of your state as a billiard ball and to
do something about it! Free will is to have a platter of options and to choose whichever one you want; it can be predetermined if you have always loved Swiss, or logically understood the superiority of mozzarella and had an inclination towards logic, but what if you saw the whole plate as one thing? What if none of it meant anything to you but your own decisions? Perhaps seeing things like this, an inclination towards peace and love would be the only actual path you would want to tread... but you certainly don't have to! Even if it's a 50/50 chance, that's still more freedom than living a mechanical, predetermined 100/0 life.
