Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Stop at Selections
MDATA_LOOP_SEL_STOP_AT_SELECTIONS
Parameter: Stop at Non-Quads
MDATA_LOOP_SEL_STOP_AT_NON_QUADS
Parameter: Stop at Poles
MDATA_LOOP_SEL_STOP_AT_POLES