"he helps run the forums so he can do whatever."
Just because he's an administrator and all that bullshit doesn't mean he's immune to rules.
Unfortunately rickrolling isn't a crime, it justs irritates the shit out of some of us...
But yes. There are certain techniques that we do not accept, such as that one you gave as an example from Cosmic Wall. Such techniques make competition less about skill, and more about memorizing how x will give you infinite points. And obviously if you can get an infinite amount of points what's the point of competing over who can get more?
Some less game-breaking techniques are usable, however. You need to submit them to the Freestyle division if they are not allowed normally. For example, the Cannon's Core glitch with Mission 2 and Chao World is usable if you submit to freestyle.