Yes, I've found you can breed selectively for other traits too! I bred the giggling twins who arrived in the crate, and all their descendants down the line giggled when you pick them up too, so I tried breeding the other sounds kids make, and found their kids made the same sounds.

Then the game forced a population explosion on me. I turned off all breeding because I had 45 people which I thought was manageable. I wanted them to farm, research, and then I could do more experimentation with breeding certain traits...glad to hear you succeeded in a running doctor! But the game ignored my choices and overnight I got 54 kids, topping out my population. There goes my selective breeding program... :/