c4d_objects/description/oedeformer_panel.hParameters are accessed with cinema::C4DAtom::GetParameter() and cinema::C4DAtom::SetParameter(). See Parameters.
Parameter: Deformation
ID_MG_EFFECTORDEFORMER_MODEID_MG_EFFECTORDEFORMER_MODE_OFFID_MG_EFFECTORDEFORMER_MODE_OBJECTID_MG_EFFECTORDEFORMER_MODE_POINTID_MG_EFFECTORDEFORMER_MODE_POLYGON