Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See page_maxonapi_getting_started_foundations_cinema_parameters.
Parameter: Stop at Boundary Edges
MDATA_LOOP_SEL_STOP_AT_BOUNDS
Parameter: Select Boundary Loop
MDATA_LOOP_SEL_SELECT_BOUNDS
Parameter: Greedy Search
MDATA_LOOP_SEL_GREEDY_SEARCH