ooo i misunderstood your question.. i do not believe you can stop-sell to open a short position when price move further down, although i am not entirely sure. let me know if u test it out.
And you definitely can't pre place a stop-loss on that order.
No problem
Well I had a good play around yesterday and I found that I could set the stop-sell order to open the short at a lower price, which is great. I could also add my limit-buy order to close the short.
But you are right, I was unable to pre-place my stop-loss order. This is the main problem for me. If the price rises again while I'm sleeping my order isn't safe. It would be great if there was a way to do this.