###This answer is now outdated as Renderman is now free and a plugin is available
This answer is now outdated as Renderman is now free and a plugin is available
This feature used to be supported, however it now appears to have been discontinued due to a lack of interest of the Blender community. Now that Renderman is free, the developer might re-launch the addon if contacted and enough interest is shown, or another person could do somehting similar, and quite possibly have better success due to the growing interest. However, as of now, this capability is not supported.