These are some interesting points. I meant "arational" in the sense that our actions are arational - rationally motivated, perhaps, but it would be incorrect to say that the action itself is either rational or irrational, hence it's arational. What intrigues me is the fact that these arational phenomena are deeply embedded in the way our minds are structured, and therefore can perhaps inform and augment the process of rationality. Indeed, some of them may be extremal states of the same systems that allow us to be rational in the first place.

I'd definitely like to see this post on Buddhism; you seem to have an excellent grasp on it.