Actually 3d Joy that is backwards. Spoilerons do exactly what the name implies...spoil the lift. This is why they were invented. Notice the spoilerons deploying on commercial jets when you land. Once they are armed by the pilot the "weight on wheels" or WOW switch activates them once you touch down. This helps to prevent bouncing on the landings and leeps the plane on the ground. Sailplanes use spoilerons to kill the lift and drop altitude quickly.

Now in 3d flight you generally want the wings in a stalled position and you are flying in what is really "vectored thrust" mode; using the engine and large control surfaces to point the a/c in the direction you want. What often happens in harriers with some planes is the wings want to keep flying and they are bouncing back and forth between flying and stalled. Thus the wing rocking. Adding spoilerons kills this oscillating lift and wallah!.......much nicer harriers. Hope this helps everyone!