I'm a bit confused.  What does it mean that 'This feature is not supported yet.'?  Does that mean it won't work?  Also, I'm not sure if it is addressing my problem.  The body style is not showing up in the ClassList drop down anyway.  In fact, I have the ClassList drop down completely disabled so it doesn't show up at all.  I just have the EditorWysiwygModeCss feature activated so the editor content area uses the dynamic css file.  I just don't want it to read the body style?  I did try what you recommended and it didn't seem to work.  I'm not sure if it is becuase it's not supported yet or just not the right solution?