It would be very out of character of Apple if it weren't configurable. Yes, iOS is secure, but OS X has always been more open in this regard and there's really

It would be very out of character of Apple if it weren't configurable. Yes, iOS is secure, but OS X has always been more open in this regard and there's really no reason to believe that they won't continue this trend. After all, when they introduced App signing they could have made it so the mac would only run signed apps. Of course they didn't do this.