A fairly simple suggestion really. I love playing Vasari, and don't like any of the other races nearly as much. I think I'm likely not the only person with this feeling. While the factions change a lot of tactics, a lot of the race is still the same.
I'd love to see a pre-game option to have the following race choices so the game would randomly choose one of the two factions:
"Random TEC"
"Random Vasari"
"Random Advent"
I imagine this would be a very easy addition. This would also allow three race games, with some mystery about what the abilities of your opponents might actually be 