It's easy, you just need to open your eyes some... In Keyclone, click the button labelled 'setup' then go to the 'do-not-pass' on the left side. Then, in the box where it says 'click here and hit a key' click there and hit the W key, and the letter W will show up in the list above.

Now do this for every key that you do not want to be passed to the other WoW clients or characters.

Sorry if I sound mean, but it is so simple, you'd seriously have to be blind to not be able to setup Keyclone on your own (minus the maximizer and commands, I had to read the guide and watch the tutorial video to do those).