Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Show Motion Clip Ghosts
ID_MT_TAG_SHOWGHOSTSParameter: Show Summary Path
ID_MT_TAG_SHOWPATHParameter: Rotation Mixing
ID_MT_TAG_RMIXINGParameter: Add
ID_MT_TAG_ADDParameter: Collapse
ID_MT_TAG_COLLAPSEParameter: Open in TL
ID_MT_TAG_OPENINTLParameter: Rename
ID_MT_TAG_RENAMEParameter: Delete
ID_MT_TAG_DELParameter: Duplicate
ID_MT_TAG_DUPLICATEParameter: Set to Zero
ID_MT_TAG_ZERO