I'm a fan of kids playing multiple positions. But for pitchers, this can pose problems -- especially if you pitch 6 or 7 innings one day, and then play in the field the next where you're required to make throws across the diamond from 3B or SS, or across the outfield. Even first base requires a decent amount of throwing.
What age do you think pitchers should think about specializing only on pitching? Or maybe not at all?