Here is my backtest idea:
1.Save all the games in the main window instead of removing them.
2. Save the opening odds (betting at closing odds is the worst thing you can do).
3. The user selectively chooses matches and backtests everything.
4. Increase the number of matches in Stake Wizard to 100 (or so).
It's that simple. Backtesting would be possible if matches were saved after the data was updated (instead of removing them like now).