Also try Commander Keen's Q3Arena Console Page (
http://www.planetquake.com/q3console/). Info on variables, tweaking, and commands.
How to ban players from your Q3A server at admincentral.net (
http://www.admincentral.net/guides/q3/banningplayers.htm). Even shows you how to ban an IP range if you need to ban someone with a dynamic IP number. One of my favorite Q3A Console Links. ;)
We really need to set up a separate forum for this topic, IMO.
The forum could deal with commands for both client scripting (configuring your game client) and server configuration (configuring your server).
I expect there will be a great deal of questions on these topics once Outcast is unleashed upon us.