From what I understand, none.
From what I've been told, Mr. Parker disliked many of the applications and theories of FMA, mainly the ' cut to cut ' idea, as well as primarily striking on the downside of the circle.
To say that a weapon is simply an extension of the hand is a half-truth; a stick brings it's own rules, as does a knife. However, if the posture, angles, mechanics and positions are not correct ( ie, the body ), then all you have is random slashing, thrusting, and swinging.
To my knowledge, much of Mr. Parker's knife and club material was never publicly released ( GOD I'd love to read his unfinished works " Speak With A Club " and " Speak With A Knife " !!!!!! ).
So, to answer the original question, none. Mr. Parker didn't go outside Kenpo principles, concepts, and applications to implement stick or knife training; he didn't have to.
Hope that helps some.