Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Initialize
ID_CA_MESH_DEFORMER_OBJECT_INITIALParameter: Restore
ID_CA_MESH_DEFORMER_OBJECT_RESTOREParameter: Auto Init
ID_CA_MESH_DEFORMER_OBJECT_AUTOParameter: Strength
ID_CA_MESH_DEFORMER_OBJECT_STRENGTHParameter: Cages
ID_CA_MESH_DEFORMER_OBJECT_CAGE_INCLUDEParameter: Accuracy
ID_CA_MESH_DEFORMER_OBJECT_ACCURACYParameter: External
ID_CA_MESH_DEFORMER_OBJECT_EXTERNALParameter: Auto Fit
ID_CA_MESH_DEFORMER_OBJECT_FIT