Huh? No clue what you mean.

Unix was designed to be a multi-user operating system. If I, say, ran a small Internet Services Provider business and my servers ran Unix, do you think I'd want any of my users to be able to mount or dismount disks, or halt or restart the system, at will? No, only I as administrator should be able to do that. In other words, it's not a bug, it's a feature.

As CrashedAgain said, Knoppix running from the CD (or installed to hard disk using a "Knoppix-style" install) is different from regular Linux, since you can become root without a password.

Can't see how changing the permissions of /tmp/.ICE-unix is going to make a regular user into a super-user. Nor can I see why you wouldn't just simply become root to do those things you mentioned.