The following is now posted on the IB site For NYSE Stocks All order types are accepted through Smart Order Routing (non-marketable orders will not be routed to the NYSE). Only marketable orders are accepted through direct order routing to the NYSE.
At least for expensive stocks would be to maintain a DATEK or other account. This is also a solution for those times you feel compelled to trade size in, say, a penny stock and are concerned about commish. Geo.