We will judge this behaviour as beneficial and as such will have to follow it. Altering the nature of the stimuli received by the brain will not alter the basic fact that, ultimately, the response determined by the brain is automated and aimed to aid ourselves, and not caused by a free-will-entity-thing.
Our actions become unavoidable and 'stuck' only AFTER they have happened. Certainly everything that happened before a car accident, can be said to have been unavoidably certain to happen, only BECAUSE those things did in fact happen. You can make pseudo-deterministic claims about the past, and yes the future has no choice but to be a result of everything that has happened in the past, but it hasn't happened yet, so you can't make deterministic statements about the future except for what you know is probably going to happen. The earth will continually rotate barring an unlikely catastrophe, but in all probability there will be a 'sunrise' tomorrow.
Now, whether you will have a specific thought and make a specific arbitrary decision tomorrow, no-one else can foretell, unless they actively create that situation.
The deterministic view describes us as infinite beings: Everything that happened in the past resulted in our existence, therefor we have always existed.
The things that you are arguing make us "stuck in a track" such as our brain's evolutionary function of propagating our genes, are the same things that are required ingredients for us to exist in the first place. If our ancestors' brains did not function to propagate their genes, that line would have been extinguished. If we're stuck in a track, it's a track where we can go forward, back, left, right, up down, and at all angles and velocities.
I think that the deterministic view is a bitter response to not having an afterlife or soul. You ought not examine your existence from these views, as if you've lost something by not believing in faith, but you still want to look down on yourself from heaven. Build the idea from the foundation up, and you will get a better idea of my angle.
ie. "Because there is no god or divine plan, my divine plan is set for me by naturalistic events. In fact, I'll just sit here and stare at a wall while naturalistic events occur around me." versus "I am a human being, and therefor have human needs and drives. It's up to me to raise my consciousness about reality, so that I can do what I (naturally, humanistically) want to do with my life while sustaining my needs."
As Dawkins says, we exist and perceive within a "middle world." On the level we perceive and exist, the "micro world" of molecular events that occur support our existence, but don't have a designing intelligence to enforce a particular fate.
If you could design your own perfect free will operable within a naturalistic world view, how would it be different than what you already have?