back testing via demo back trading

It would be absolutely fantastic to be able to trade previous chart data and market activity as if it is happening in the current time-frame. So for example, a new ctrader app, or active within the current platform, where I can select... lets say last week, etc... then trade that on demo. This allows people with limited time to gain more actual trading experience, as they'd be able to trade when the market was actually closed such as weekend when they'd have the bulk of their time free, but the markets are actually closed, and additionally, they'll be able to replay a bad market decision and revisit that and see how they should have traded. Its a different ball game looking at previous chart data and predicting how a trade could be done to trying to form a trade on a moving chart... Its just a great things to have ! Additionally, they'd be able to place trades in hind site, and marry that up with previous types on news releases and economic announcements potentially giving them knowledge and insight for future forecasts.