Edit: We have a "no no" line on our stick. Basically a big bright piece of duct tape around the center of the stick. Kiwi stays on his side, I stay on mine. When he was new I devised this because he wanted to crawl up the stick to bite me. I started backing him off with whatever was handy (usually a big plastic spoon) and tapping the line with it so he understood "go past this line, get backed down". He does not cross the line anymore, even if he's REALLY mad. I also use the stick regularly, even when he's in a good mood. That way he does not associate the stick with "being in trouble", it's just another part of his daily routine and gets less protest when he is pissed

I know this sounds totally stupid, but theres a show called "Super Nanny" where this last instructs parents how to get their kids under control. Many of the concepts in that show they're using on misbehaving small children can easily be applied to our misbehaving feathered children and work very effectively.