Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Strength
ID_DELTAMUSH_DEFORMER_WEIGHTParameter: Iterations
ID_DELTAMUSH_DEFORMER_SMOOTH_ITERATIONParameter: Smooth View
ID_DELTAMUSH_DEFORMER_SMOOTHVIEWParameter: Tangent Mode
ID_DELTAMUSH_DEFORMER_TANGENT_TYPEParameter: Smooth Type
ID_DELTAMUSH_DEFORMER_SMOOTHTYPEParameter: Pin Border Points
ID_DELTAMUSH_DEFORMER_PIN_CORNERParameter: Initialize
ID_DELTAMUSH_DEFORMER_INITIALParameter: Release
ID_DELTAMUSH_DEFORMER_RESTOREParameter: Mode
ID_DELTAMUSH_DEFORMER_INEXCLUDE_MODEParameter: Tags
ID_DELTAMUSH_DEFORMER_INEXCLUDE_LIST