Multiple order issue

When I put a limit order it stay in pending section as usual say I put+30 point & now I am on Chart showing+20 point & I want to close as market order.But issue is I have to go in pending order section & cancel it …Then it will execute.,..by that time profit decrease…..by default any pending should be cancel with out manual intervention….. Already Sahi giving this feature & multiple pending order without extra margine….. please think about it