I have answered this same question last week on the FrameScript forum. In that scripting product, there is an option to execute any FrameMaker command as long as you can find the command name. Looking for the command in config files I noticed that the command is not there. It is probably added to the menu via MasterPages.DLL which would imply that it is implemented as a FrameMaker client. This means you should be able to call the command via CallClient, but you would have to know the client name and the command to use. If I find out more, I will post a new reply here. Or maybe someone from Adobe can enlighten us on this point.
Kind regards
Jang