Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Target
PREF_IMEXPORT_NODESPACE
Parameter: Color Space
PREF_IMEXPORT_OCIO_IMPORT_MODE
Parameter: Show Dialog
PREF_IMEXPORT_SHOW_IMPORT_DLG
Parameter: Merge on Drag & Drop
PREF_IMEXPORT_MERGE_ON_DD
Parameter: Verify Scripts
PREF_IMEXPORT_VERIFY_SCRIPT
Parameter: Flush Data
PREF_IMEXPORT_VERIFY_SCRIPT_FLUSH
Parameter: Color Space
PREF_IMEXPORT_OCIO_EXPORT_MODE
Parameter: Show Dialog
PREF_IMEXPORT_SHOW_EXPORT_DLG
Parameter: PREF_IMEXPORT_INFOTEXT
PREF_IMEXPORT_INFOTEXT