Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: MDATA_CREATEPOLYGON_BUTTON
MDATA_CREATEPOLYGON_BUTTONParameter: Create
MDATA_CREATEPOLYGON_CREATEParameter: N-gon Subdivision
MDATA_CREATEPOLYGON_NGON_SUBParameter: Snap to same level like previous point
MDATA_CREATEPOLYGON_SNAPTOParameter: Only Select Visible Elements
MDATA_CREATEPOLYGON_VISIBLE