When you enter an order on C2, you have the option of setting a stop. I would like an extra field added to the stop-loss order for quantity so that it can be used to reverse a position from long to short or vice-versa.
For example, see the red box, which I crudely used copy-and-paste in Paint to put it there.
http://i.imgur.com/JIIpc.jpg
In this case, putting a quantity of 2 there in the box would lead to a buy-to-open order for 1 ES, but stop-loss order to sell for 2 ES.