I've set up a little file so you can see how to use the effectors. Check it out and then read the rest of this:
http://www.c4dtraining.com/Tutorials/boxesDrop.c4d
I've applied 3 effectors to the cloner. First in the list is the random effector. It's not set to transform any property, but the weight transform is set to about 50%. Next in line is the shader effector, effecting just one direction for position. It's falloff is set to linear and then rotated so it is facing up. Animating the falloff will cause the cubes to fly away, or return...then I added a delay effector to add a little bounce at the end...otherwise it's a little to linear....
Let me know if that helps...
Tim
