You're right that when using the "Send to LO" from SU you only
"export" the particular scene you1re in in SU.
However if you use the "Insert" function in LO (File menu) and
"insert" (import) the SU model, you can have the scenes altogether -
see attached pic:
http://sketchup.googlegroups.com/web/LOScenes.png
Gai...