How can KiWi.ac (New Zealand) servers be improved?

[Edward]

Yep servers with lua mod are really nice. For example some gema servers running lua mod are able to detect a killer, to take his IP and to ban him (also add the IP to the blacklist for some of them). It would be useful for teamkillers or hackers.

You can customize your server and it is very easy. Here is one of the lua mod I know : http://sveark.info/ac/Lua/