All missions cheat:
 Simply go into the main game directory and find the file game.ini. 
 Then change these lines: 
 
 FedLevel=1 
 KliLevel=2 
 RomLevel=3 
 TauLevel=4 
 MetLevel=5 
 HubLevel=6 
 
 to: 
 FedLevel=100 
 KliLevel=200 
 RomLevel=300 
 TauLevel=400 
 MetLevel=500 
 HubLevel=600 
 
 Now when you run the game all the missions for each of the 3 races
 will be available, playable in any order