Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Size
DEFORMOBJECT_SIZE
Parameter: Alignment
DEFORMOBJECT_ALIGNMENT
Parameter: Fit to Parent
DEFORMOBJECT_FITTOPARENT
Parameter: Mode
DEFORMOBJECT_MODE
Parameter: Strength
DEFORMOBJECT_STRENGTH
Parameter: Angle
DEFORMOBJECT_ANGLE
Parameter: Curvature
DEFORMOBJECT_CURVATURE
Parameter: Fillet
DEFORMOBJECT_FILLET