Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Emulation
MGDISPLACER_EMULATIONParameter: Strength
MGDISPLACER_DISPLACEMENT_STRENGTHParameter: Height
MGDISPLACER_DISPLACEMENT_HEIGHTParameter: Type
MGDISPLACER_DISPLACEMENTMODEParameter: Direction
MGDISPLACER_POLYNORMALMODEParameter: Process Normal Tag
MGDISPLACER_PROCESS_NORMALTAGSParameter: Legacy Mode
MGDISPLACER_LEGACYParameter: Camera Dependent
MGDISPLACER_REFRESH_CAMERAParameter: Backface Cull
MGDISPLACER_REFRESH_BACKFACECULL