Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Spline Subdivision Factor
COLLADA_IMPORT_SPLINE_SUBDIVISION_FACTOR
Parameter: 2D Geometry
COLLADA_IMPORT_2D_GEOMETRY
Parameter: Animation
COLLADA_IMPORT_ANIMATION
Parameter: Fix Transparency
COLLADA_IMPORT_FORCE_TRANSPARENCY_OPAQUE_MODE_TO_RGB_ZERO