I know that if you clear Dorman Trading, and use the T4 platform you can set daily loss limits, beyond which you will NOT be able to initiate new positions. For my accts I have it set at 2% but never hit it. Hope this helps. PM me if you need a contact. T4 is much better than Ninja, FYI.
Downloaded a demo of OEC, the risk manager there doesn't exit the platform all it can do is exit your positions at market and it seems like you can continue to trade afterwords. Also they don't seem to have day trader margin on a number of futures I trade so I guess they're out.
you can spend your whole life going to a freudian psychologist and try to find the cause of your behavior. or you can accept it and try to the right thing in spite of they way u are wired.
Take a look at GSTrader, once you reach the loss limit you've set, it's in a dollar amount format, the platform offsets your position at the market price and does not allow trading until the next trade session or until the loss limits are changed on the back end.