Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Strength
MGINHERITANCEEFFECTOR_STRENGTHParameter: Selection
MGINHERITANCEEFFECTOR_SELECTIONParameter: Inheritance Mode
MGINHERITANCEEFFECTOR_MODEParameter: Object
MGINHERITANCEEFFECTOR_OBJECTParameter: Morph Motion Object
MGINHERITANCEEFFECTOR_MORPHMGParameter: Falloff Based
MGINHERITANCEEFFECTOR_FALLOFFTIMEParameter: Transform Space
MGINHERITANCEEFFECTOR_SPACEMODEParameter: Animation
MGINHERITANCEEFFECTOR_EASEParameter: Start
MGINHERITANCEEFFECTOR_ANIMATEFROMParameter: Step Gap
MGINHERITANCEEFFECTOR_STEPParameter: End
MGINHERITANCEEFFECTOR_ANIMATETOParameter: Loop Animation
MGINHERITANCEEFFECTOR_LOOPANIMATIONParameter: Position
MGINHERITANCEEFFECTOR_POSITION_ACTIVEParameter: Rotation
MGINHERITANCEEFFECTOR_ROTATION_ACTIVEParameter: Scale
MGINHERITANCEEFFECTOR_SCALE_ACTIVE