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Multi-leg order entry would be useful for options spread traders. While single leg trade entry has similar results at times, other times it is materially worse. Spread-entries often benefit from price-improvent and/or margin relief, relative to the same position entered by one leg at a time. Some positions are even impossible to enter without spread order entry, due to account restrictions or market conditions. Three examples to illustrate: Example for price improvement--enter long in an SPX option(min tick size is $0.05): If the ask is $0.05 and the bid is $0.00 then the single leg trader must enter with a market order at $0.05 as it is not allowed to place a limit buy at $0.00. A spread trader, however, can buy the option as part of a multi-leg order and get filled on this option between $0.01 and 0.04. Example for margin relief--AMZN calendar spread ($988 stock): A calendar spreader can be smoothly enter a two-leg calender for $40.00/share. This requires $4k in buying power before doing the trade. However, the single-leg-order-entry trader, to get the same position, might have to first enter the long for $400/share, then enter short for $360/share. This requires that the account have $40k in buying power before starting the first leg. Example for price improvement: many two-leg spreads can get filled mid-way between the composite bid and ask, but the same trade, as a single leg, can't filled without a marketprder Despite all the above, I am happy to see that open option spread positions can currently be closed in Medved Trader.