I played that AIX mod for a while yesterday and it was a blast.
I had a small glitch with the thunder sound effects on the new Karkand map, but other than that it was great.
I was a little surprised that they limit you to 32 bots\players though. 64 would have been awesome.
EDIT: Nevermind, its all explained here: http://www.aixtended.com/faq.html