[Crow King]

Myself and two others tried when the game first came out to use the file functions & cvars via a script to detect cheats. The problem is, while you can access files on your own machine fairly easily, the developers were not real comfortable (for good reason) giving scripters the ability to access the file system on client machines via the server. There are worse things than cheating.

There is a downside to the SDK coming out - the "safe harbor" will go away. However, there are significant upsides, too. The community's ability to create will increase exponentially. If things get really bad, someone will write a verifier that runs on both the client and server that checks for cheats prior to allowing you to join the server. People who care enough about the issue will download it and server admins who care will run it.