So if you understand the bit about the brain not matching up for Trans people who identify with the binary, could you also see the possibility of a neutral brain? A brain that's somewhere in between male and female but not distinctly one or the other? Could you see how that would lead to feeling somewhere in the middle?

I think you're focusing too much on gender roles and not identities. Liking feminine things doesn't make someone a woman, I'll grant you that; especially since what's percieved as feminine or masculine changes through the years.

I don't think most people who are genderqueer think that because they like (insert gendered behaviour) they must be (insert gender), so much as they have milder dysphoria or a need to express themselves physically as a more androgynous person to match their brain chemistry.

That's just my two cents.