Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Initialize
ID_CA_SMOOTHING_DEFORMER_OBJECT_INITIALParameter: Restore
ID_CA_SMOOTHING_DEFORMER_OBJECT_RESTOREParameter: Strength
ID_CA_SMOOTHING_DEFORMER_OBJECT_STRENGTHParameter: Type
ID_CA_SMOOTHING_DEFORMER_OBJECT_TYPEParameter: Iterations
ID_CA_SMOOTHING_DEFORMER_OBJECT_ITERATIONSParameter: Stiffness
ID_CA_SMOOTHING_DEFORMER_OBJECT_STIFFNESSParameter: Keep Displacements
ID_CA_SMOOTHING_DEFORMER_OBJECT_DELTA_LOCKParameter: Stiffness Map
ID_CA_SMOOTHING_DEFORMER_OBJECT_STIFF_MAP