mograph/description/oeinheritance.hParameters are accessed with cinema::C4DAtom::GetParameter() and cinema::C4DAtom::SetParameter(). See Parameters.
Parameter: Strength
MGINHERITANCEEFFECTOR_STRENGTHParameter: Selection
MGINHERITANCEEFFECTOR_SELECTIONParameter: Inheritance Mode
MGINHERITANCEEFFECTOR_MODEMGINHERITANCEEFFECTOR_MODE_DIRECTMGINHERITANCEEFFECTOR_MODE_ANIMATIONParameter: Object
MGINHERITANCEEFFECTOR_OBJECTParameter: Morph Motion Object
MGINHERITANCEEFFECTOR_MORPHMGParameter: Falloff Based
MGINHERITANCEEFFECTOR_FALLOFFTIMEParameter: Transform Space
MGINHERITANCEEFFECTOR_SPACEMODEMGINHERITANCEEFFECTOR_SPACEMODE_GLOBALMGINHERITANCEEFFECTOR_SPACEMODE_NODEParameter: Animation
MGINHERITANCEEFFECTOR_EASEMGINHERITANCEEFFECTOR_EASE_INMGINHERITANCEEFFECTOR_EASE_OUTParameter: 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