[God Emperor]

If you want to play against the mod pack races, you should select them using the "Add Existing" button, then edit them to set them as a computer player rather than a human player. That should be it.

Regards,
GE

PS: I suggest that you give the AI at least a low bonus. A lot of races can make use of a medium bonus but most cannot make use of the extra resource points that high bonus gives - this can be changed by adjusting the values in the Construction Vehicles files...

eg if the value for Attack ship is 20 say, it should be adjusted to 10 if you intend to use high bonus and want the AI to take advantage of the extra resource points it will get....