How about a Dynamic Risk calculation window on the account bar at the top of the trader Window. I would not want this behind a drop down menu, it would be best to be constantly displayed.
A window displaying the “Risk Value” based on a percentage you set of your accounts Equity would be great. Allowing at a quick glance you could make sure you are within your Risk tolerance rule set. It would dynamically change with your account so you would not have to figure it out each trade and also would not have to leave the Trader App to use another calculator app.