(how about NOT yelling).
Quite the opposite. If you want the wing to stall early you make the leading edge sharper. Take a trip to the local airport and have a look at the puddle jumpers. Many of them will have short lengths of angle aluminium rivetted onto the wing root leading edges. These are called WEDGES and their purpose is to promote early wing root stall - the pilot then gets to feel the onset of the stall (mushiness, nose down pitch, etc.) while at the same time having full aileron control because the wing tips are still flying.