perhaps you'd like to EDIT the packets
a nice editor is raw packet editor.
there are plenty sniffers around.
if you really want to use wpe, then you'll need 2 pcs.
one pc is a proxy server (with ccproxy) where wpe is running at, and the second computer which connects to the game through the proxy service of the other computer.
if you have NO IDEA what I'm talking about : Google.com
basics of network computing....