But this presupposes the possibility of not following the tracks. Therefore it presupposes the belief in alternative possibilities, so the belief in free will is therefore also presupposed in your example.
You have just replaced one semantic issue with another.
Look directly at the subject at hand. If the person, computer, or other type of machine, is forced by a deterministic world to make the action that it does, then it is impossible for it to act otherwise. Therefore it does not make a choice, selection, or decision, at any time, as those words are commonly used in a discussion of free will. You can redefine those words however you want, to suit your purpose, but it doesn’t change the fact that when people think about their own capacity to choose, select, and decide, they honestly believe that other possibilities are available. So all your are doing is redefining the words to suit some deceptive purpose.
The issue then, as I see it, is that if the passing of time provides the living being which exists at the present, with real possibilities to select from, regardless of micro/macro, conscious/subconscious distinctions, then we must account for the reality of the selection process.
This might be the most difficult aspect of free will to understand. Suppose there are a number of possibilities which can be actualized at any moment as time passes. If, whatever it is that selects from the possibilities, and produces an actualization, is said to act in a determined way, then it does not really select from possibilities, because it just actualizes what was predetermined. Then the other so-called “possibilities” were not really possibilities at all. Therefore, to maintain the principle, that the possibilities are real, and something actually selects what will be actualized, from the realm of possibility (the future), we must assume something which acts in a way which is free from deterministic causation. That is the free will agent.
And I agree with you that the free will agent is not the conscious mind. The conscious mind is an apparatus set up by the living being, which is specifically designed to assist in analyzing possibilities and in making free will choices. Notice that the conscious mind does not actually make the free will decision, it is not the agent. If it did, then the choice would be determined by the thinking activity of the conscious mind, and not free. But we notice that in reality we can choose other than what the rational mind tells us to do, therefore the actual free will agent, what chooses the possibilities to be actualized, is not the conscious mind.