Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Tension
MDATA_SETEDGEFLOW_TENSION
Parameter: Maximum Angle
MDATA_SETEDGEFLOW_ANGLELIMIT
Parameter: Equal Spacing
MDATA_SETEDGEFLOW_EQUALSPACING
Parameter: Linear
MDATA_SETEDGEFLOW_LINEAR
Parameter: Fallback Mode
MDATA_SETEDGEFLOW_FALLBACKMODE