Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Select Pushed
HAIR_TOOL_PUSH_SELECTParameter: Surface
HAIR_TOOL_PUSH_SURFACEParameter: Use Normal
HAIR_TOOL_PUSH_USE_NORMALParameter: Distance
HAIR_TOOL_PUSH_DISTANCEParameter: Strength
HAIR_TOOL_PUSH_CURVEParameter: Guides
HAIR_TOOL_PUSH_GUIDESParameter: Distance
HAIR_TOOL_PUSH_GUIDES_DISTANCEParameter: Relaxation
HAIR_TOOL_PUSH_GUIDES_RELAXParameter: Strength
HAIR_TOOL_PUSH_GUIDES_CURVE