Hi bennyxu,
AFAIK, there is nothing special about the SRecord generation with ROM libraries compared to the SRecord generation with "normally" linked applications.
Do you build from within the CW ide? If so, add a *.bbl file to your project, the SRecord ends up in the bin folder in the "normal" setup.
If you are building with a makefile, use the burner.exe to create an SRecord.
Daniel