Mirror Universe, 3 scenarios for Star Trek Expanded can be downloaded here: http://forums.civfanatics.com/downloads.php?do=file&id=19753
I've noticed something strange: in my Mirror III scenario there is the option to choose 'Cardassia' as a player, although it has the Klingon-Cardassian Alliance in it. I've checked Worldbuilder but no separate Cardassian start position shows.
Reloaded the file after eliminating Cardassia altogether.