I’m late to this question, but the mentioned option is still missing in Xcode 5 & 6, so the question is still meaningful.
Actually, we can always set a value to any property of a view/control/object by adding a User Defined Runtime Atribute in Storyboard (Interface Builder) like the following screenshot.
And it also works for translatesAutoresizingMaskIntoConstraints. So the question could be solved.
