Damn, I spoke too soon. :(
I did a simple CSG test with elliptical_torus before I posted my original
reply, and it seems to work OK.
I have since done further CSG tests which fail.

For instance, this appears to work.

difference {
  // The elliptical torus
  object {
    elliptical_torus( x_major_radius, z_major_radius, minor_radius )
    rotate x * 90
  }
  // The elliptical cylinder
  cylinder {
    < 0, 0, -minor_radius >, < 0, 0, minor_radius / 2 >, 1
    scale < x_major_radius, z_major_radius, 1>
  }
  pigment { color Red }
}

... but this fails

difference {
  // The elliptical cylinder
  cylinder {
    < 0, 0, 0 >, < 0, 0, minor_radius >, 1
    scale < x_major_radius, z_major_radius, 1>
  }
  // The elliptical torus
  object {
    elliptical_torus( x_major_radius, z_major_radius, minor_radius )
    rotate x * 90
  }
  pigment { color Red }
}

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