Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Strength
MGINHERITANCEEFFECTOR_STRENGTH
Parameter: Selection
MGINHERITANCEEFFECTOR_SELECTION
Parameter: Inheritance Mode
MGINHERITANCEEFFECTOR_MODE
Parameter: Object
MGINHERITANCEEFFECTOR_OBJECT
Parameter: Morph Motion Object
MGINHERITANCEEFFECTOR_MORPHMG
Parameter: Falloff Based
MGINHERITANCEEFFECTOR_FALLOFFTIME
Parameter: Transform Space
MGINHERITANCEEFFECTOR_SPACEMODE
Parameter: Animation
MGINHERITANCEEFFECTOR_EASE
Parameter: Start
MGINHERITANCEEFFECTOR_ANIMATEFROM
Parameter: Step Gap
MGINHERITANCEEFFECTOR_STEP
Parameter: End
MGINHERITANCEEFFECTOR_ANIMATETO
Parameter: Loop Animation
MGINHERITANCEEFFECTOR_LOOPANIMATION
Parameter: Position
MGINHERITANCEEFFECTOR_POSITION_ACTIVE
Parameter: Rotation
MGINHERITANCEEFFECTOR_ROTATION_ACTIVE
Parameter: Scale
MGINHERITANCEEFFECTOR_SCALE_ACTIVE