Thanks for the feedback - nice to know I'm not the only one!
However, I do think you can do what you want under the "Players" option in the game setup. Under there, you can create a new race, and one of the options there under "Description" is "Demeanor". Under that you have options such as psychotic, serene, aggressive, violent, honorable, etc. I am assuming that these somehow modify created races' behavior?
Well, I guess for my next game, I'm going to have to move beyond the stock races shipped with the game and create my own - perhaps a reprise of some of my favorite MOO races, with the specialties - too bad I can't recreate a Silicoid race that can colonize everything - that doesn't appear to be an option

The only thing that makes this difficult is play balancing. If I create a Meklar like production oriented race, how do I know if a 10%, 30% or 50% bonus is enough or too little.
Hmm, maybe I'll create 6 psychotic races for my next game and see what happens! If I do, I'll let you know and post it here!
Grifman