Not all lenses are like that since it cost money to build it that way
The kit lens technology (quick shift) wasn't there when AF lenses were first made.
A trick is to press the button that releases the lock of the bayonet mount (the one you press when you want to change lenses), and the af gear will be disengaged. I'm not aware of some software fix to do this, because it's limited by hardware.
Canon and Sony has some lenses that quick shifts and can still turn even when the lens has hit infinity/minimum distance, becoming a little stiff but still safe to turn when it does so. It's even nicer that our DA lens' quickshift