Not being funny but just lock this thread.
Ridiculous idea.
If anyone is going to refer to 'realism' again for this thread
Why dont i get a blunt weapon and smack you full on anywhere and expect you to still be standing you'll be a fking robot any blunt weapon anywhere is going to cripple you enough to drop a person to the ground so to add only hitting the legs is a stupid idea.
Sorry to be blunt but it's to the point!
Cheers