I use the "speedhacknt"
My Buttons are:
Normal: 8
Fatser: 9
( No Numlock Buttons for me )
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The cheat will just make your Real PingLower / Higher ( you can see that with "devtraf" writing in console ).
You can get it to a RP of: 0 , and also to a RP of 40000.
This will probally make you un defeatable, but i'm not quiet sure about that, though your vietcong or computer crahses after you leave the server, or the map changes...
If you want more, you know how to get it..
-X