Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
I think this is really for -compose blur at http://www.imagemagick.org/Usage/mapping/#blur. The only thing that is missing in the documentation is to associate it with a -compose method.
You are correct. But I am not sure how to fix that. It is documented at http://www.imagemagick.org/script/compose.php. So perhaps it just should be removed from the "convert" methods list all together.