Replicate old system (VV US) whereby backtesting can be marched forward one day at a time.
In the old system, one could create a portfolio on a certain date and then march it forward one day at a time with one click. This was a wonderful educative tool and enabled the member to observe the behavior of the portfolio vis a vis the broad market and other factors. This is a big confidence builder in using the more aggressive and successful but highly volatile strategies. (Think bottom fishing strategies).