You can supply command line parameters (switches) to Dominions in order to make it start up a server automatically.
DominionsX has info on command line switches.
http://www.shrapnelgames.com/cgi-bin...;f=74;t=002054
Look what psientist says here for some info on how to use apple script and switches:
http://www.shrapnelgames.com/cgi-bin...;f=74;t=002054