Interesting thought. I myself believe strongly in "choice", in most of life's matters. To this day, it has been mostly spiritual strength and disease resistance (immune system). As for actual capabilities - I'm not decided yet.
But then, if you said a person can choose whether or not they behave stupidly, whether or not they can think logically, WON they can think in abstract meanings, WONTC do what others can't - where is the boundary between all that and deciding who you are born? Where you are born? What (species, race, class) you are born into?