It used to.
I haven't changed any of the code that would effect this.
Currently only Bounce Mode, not Combine mode will affect the rotation of a body. However, both modes will effect the direction of collided bodies.
Techincally, it will move a few atoms.
That's basically true. The effect of a small body on a large one is going to be minimal and perhaps unnoticeable.
Try making the mass of the smaller body (the 'Nuke') much larger to see the effect.
Or try this:
- Open Earth & Moon
- Launch moons at the Earth (press F on your keyboard)
- Notice how little the Earth moves, but that it does move.