theirs alot of crap that surrounds the whole dim mak thing but i mean i'm sure that their is someone around who can trigger pressure points to cause CERTAIN effects such as KO's, i mean i met a guy who knocked himself out with a bouncy ball when he was throwing it in his house and it just caught him in the right spot

Testable and repeatable. Thats what something needs to clearly establish in order to be made and presented as functional.

If something is neither of those things, would you want to spend any considerable time on it when your objective is to develop physical and mental skills with which to effectively fight?

My answer would be no. My opinion is, things like chi and dim mak, etc belong on the shopping mall circuit in the "chop socky" demonstrations.