I too, would love to be able to generate individual officers with specific skills. This could lead to players to take the easy way out and make ridiculously skilled teams right from the start if they wanted to 'cheat' but I like the RP possibilities for weighting your people to fit a RP racial skew.
You can regenerate all your people right from the start to try and generate a better distribution to your liking. I like to reroll for my scientists to try and get a couple useful ones in missiles, propulsion and construction right from the start.