No 'points' cost should be necessary. It's the character of the race and therefore self-limiting. They should act the same whether you are ruling them or someone else is ruling them, or nearly so. The meaner you make them, the meaner they are for you, too.
A slight modifier for 'alien' rulers is a good idea, but could you honestly make a race that's civil and governable while under their own rulership and ugly when conquered and call it realistic?
If they retain this 'happiness setting' along with their various aptitudes life could get really interesting as you try to get a cantakerous race that happens to have great intel bonuses to work your intel facilities for you and they keep rioting. Or even if you get control of a fairly passive race population that breathes another atmosphere and has no 'great' production bonuses do you use them to 'expand' planets of the appropriate atmosphere or wait for atmosphere converters and use your own race which has better bonuses? (Penalties for mass genocide need to be installed to deter the obvious solution that som smart aleck will now post: use them now, space them when you get atmosphere converters and can send in your own race...)
[ July 18, 2002, 02:31: Message edited by: Baron Munchausen ]