I'm guessing that if you don't know how to run the backtest, asking if you could not just knock up a volatility stop indicator in their builder may be a stretch then?
I've taken big liberties with the 50 bit of your request, hopefully I've captured the essence of what you wanted??? and also the stop is definitely not what you were after but seemed to work ok'ish
Thanks for doing the backtest, i will try to see how can I build the volatility stop and include it in the scan, apparently in prorealtime the have programmers that do it for you, I will have to wait couple of weeks but is better than nothing.