How do i make a soft body stop being manipulated and keep its bent form

How do i make a soft body stop being manipulated and keep its bent form.
i am so close to impact deformation but can’t get it quite right.Is there anything on impact deformation in blender other than soft bodies.

check out the blend file located here

http://http://blenderartists.org/forum/showthread.php?t=121444

He achieved dents by a python script.

i do believe that the link is brokded:(

never mind i got it working:o