Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Iterations
MDATA_EDGESMOOTH_STEPS
Parameter: Keep Spacing
MDATA_EDGESMOOTH_KEEPSPACING
Parameter: Select Outline
MDATA_EDGESMOOTH_SELECTOUTLINE