I am finding it interesting to learn about the Abhidhammic way of looking at things. So when I searched ATI for "magga-paccaya" I also found this in The Abhidhamma in Practice
, by N.K.G. Mendis, in a list of "paccayas" (Modes of Conditioning)
Faculty condition (indriya paccaya). There are twenty-two faculties: six sense bases, two sexes, the life faculty, five feelings, five feelings, five spiritual faculties, and three supra-mundane faculties. Except for the two sexes, the other twenty can exercise control in their respective spheres on the co-existent mental states and the material phenomena they originate. For example, mindfulness — one of the five spiritual faculties — has a controlling influence on the other four co-adjuncts during meditation.
and also this:
http://www.accesstoinsight.org/lib/auth ... el322.html
Free Will. Someone might say: "If all phenomena are conditionally arisen, then Buddhism is a form of fatalism, for we have no free will to control our destiny." Such a statement would not be correct. Will is volition (cetanaa), a mental state, determined ethically by its root condition (hetu paccaya). If the root is unwholesome, we can either restrain or indulge the volition; if the root is wholesome, we can encourage it or neglect it. In this exercise of will lies our freedom to guide our destiny.
"When one thing is practiced & pursued, ignorance is abandoned, clear knowing arises, the conceit 'I am' is abandoned, latent tendencies are uprooted, fetters are abandoned. Which one thing? Mindfulness immersed in the body." -AN 1.230