Keyboard shortcuts: "X".
How it works: when the hotkey "X" is pressed, the left mouse click will send a buying order with the volume of the first seller. Right-click will send a selling order with the volume of the first buyer. If the order opens or increases position, so minimal amount of volume will be selected from the currently and market positions (if operational volume is 10, but the volume of seller is 3 that means the volume which contains 3 lots will be send; if operational volume is 10, but the volume of the first seller is 100, that means the volume which contains 10 lots will be send). If the order closes a position, the minimum volume is selected from the current operational and market positions (if the open position is 5, the operational volume is 10, and the volume of the first buyer is 1, that means the volume which contains 1 lot will be sent).