Supposedly CTP2 is immensely moddable. But I'm having a lot of difficulty finding much on the subject, other than Apolyton patch. Lots of abandoned and dead links to mods like AOM, which I guess has a fourth edition out before it disappeared? Too bad, I'd really like to try these mods, but it seems they've gotten scarce for some reason.

http://apolyton.net/showthread.php/193669-Where-can-I-get-the-AoM-files

Link to AOM4 download in the thread.

http://www.weplayciv.com/forums/downloads.php?do=cat&id=12

Lots of mods there but base AOM download doesn't work.