Originally posted by 1UP
If a game is server sided you won't be making anything useful that deals with the client outside of bots. You would need to understand packet editing and I don't believe anyone is going to just hand you source code without you putting in some effort.
Well, to begin making useful stuff when a game is server sided, you'll need to find the functions it uses to send the data to the host. But the alternative to that as is you have specified; Packet editing.