The commands we use are not in files as such, they are controlled and inserted into the server, so you can't edit them. They are called "Flhook" commands (Google that) and the source is pretty readily available. They're written in C++, so a knowledge of that language is pretty essential (I've been learning for the last 5 or so months, and still have trouble doing anything than make text appear ingame at a command).
Person to contact for more information (I got all this from him) is the user "Cannon". He wrote most of the commands we currently use.