Hi AEScott--
Have you followed the step-by-step instructions on http://discussion.autodesk.com/thread.jspa?messageID=5561856
There is a video there as well.
Placing lights/switches has nothing to do with Copy/Monitor... so I'm not sure what you mean by Copy/Monitor doesn't allow it.... certainly, you can't Copy/Monitor Lights or Switches, but you can place after you have linked and C/M'd the levels and rooms.
After you have setup your project, and setup the Copy/Monitor of the levels and rooms, you can place any face-hosted or un-hosted families, load and place the following:
Face Hosted:
C:\Documents and Settings\All Users\Application Data\Autodesk\RME 2008\Imperial Library\Electrical\Devices\Lighting Switches.rvt
C:\Documents and Settings\All Users\Application Data\Autodesk\RME 2008\Imperial Library\Electrical\Lighting Fixtures\Plain Recessed Lighting Fixture.rfa
Unhosted:
C:\Documents and Settings\All Users\Application Data\Autodesk\RME 2008\Imperial Library\Electrical\Lighting Fixtures\Troffer Corner Insert.rfa
When using a linked file, you can't use Wall, Ceiling, Roof, or Floor hosted... this is why (most of) the content that ships w/ RMEP is face hosted.
HTH,
Martin Schmid, P.E.
MEP Project Consultant
Autodesk Consulting
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.