It should work with SMB, since HereSphere is able to read the script file from your SMB share as well. Just make sure it's in the same folder as the video, and has the same name except for the extension.
It doesn't seem to. The correct extension is .CMScript correct? Heresphere is reporting no script found. I can only seemingly get cmscripts to work by accessing POVR in non-API mode which obviously is not the best viewing experience.