There are also several clientside variables which accomplish the same thing, except for 'bobbing' and a few other things. These really should be moved serverside imho.
Uhm, is your speciallity only ripping off ascii or do you also use that what passes as a brain for you?
If the QVM is not patched to use knockback, you can set whatever cvar you like, but don't expect any reaction, not that you could expect any while using CLIENT-Vars...