These themes are explored in the Dice Man. Good book. I find these ideas are better explored in narrative form.
That's because i'm not so sure about myself. I suspect that the reductionist approach has its limits at that point new behaviors emerge from simpler antecedents. If consciousness is an emergent behaviour then i don't think a reductionist approach is the best way to think about free will. But i'm not sure what the best approach is - Eise offers a compelling alternative, but i'm deliberately sceptical as it contains an emotional draw for me.
I'm not sure how useful this distinction between internal and external forcing is - brain processes are as much a part of the universe as anything 'external'. However, if by internal we simply mean those processes which i call me by convention i can see some utility - though the boundary becomes blurry when we consider that our gut micrbiome influences neural processes, as do social interactions, our environment etc...
May i ask, since this is the religion forum, if you're position on free will mirrors that of the Buddhist concept of self: a useful concept for everyday life, but there is no True Self that somehow sits outside the universe upon the throne of decision making.
If we accept a deterministic universe (which i think all parties here do?), then in what sense could we say that humans have free will and that some AI in the future could not?
AI, even today, can act in ways that are not explicitly coded. It may have a utility function which it seeks to minimise, but it is 'free' to find any means to this end. Identical AI agents can easily converge to different solutions if they are learning agents - the data inputs help them navigate the landscape of all possible actions they could perform, and even slightly different data could lead to a divergence of behaviour. The difference between them would lie in the accumulated weights of their neural networks rather than their code.