Volume env Fog and Fog fade out radius

If I have a sphere with a fractal mapped to density of the volume shader, I want a nice soft fall off around the edges of the object so I can create clouds out of spheres. I can’t seem to get the fog radius to actually work. Has anyone had success on this?

Yes, there is something wrong there.
I have reported that to the developers and they said that this is going to be fixed in the tomorrows nightly.

Whew, I thought I was using it wrong! Thanks Zdravko!