Hmmm, I don’t have Cinema open right now, but what if you set the cloner mode to object and used the spline you were using as a mask in the object field?
if you don’t want them to intersect, you would probably have to use dynamics for collision detection. If you have 11.5 MoGraph2 is awesome…otherwise it’s a little more difficult.
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….
You could use a spline mask (using a spline of the United States) with a grid cloner, then use an effector to cause them to fly away…then just animate the falloff to cause them to fly in instead of away.