I think this is what we are looking for: https://www.youtube.com/watch?v=caHDCYyULqA
1) Place a limit order to buy
2) Hit the "Trigger" button on the bottom right of the montage
3) In the popup box set the Route to "Stop"; Set the Stop Range to "Range"; Enter the Lo Range (the stop limit) and the Hi Range (the target)
4) Then in the working orders window under "Type" it will say L.TN, meaning that when executed it will trigger an order. Right click the working order to edit the triggered order.
Of course, this is not the same as setting a single order that includes the buy limit order and trigger, and theoretically the buy could be executed and then the stock could dive while one is setting up the trigger. It is also not the same as a hotkey that simultaneously buys at market and sets the bracket. But it's a start