Herman, Your case for System Performance Indicators is a good one.
A further idea... there should be no need for User code to accomplish this. The plots should be a native feature of AB (just like the Equity plot). Instead of plotting "flat lines" for single numbers, gfx Horizontal plots of each performance metric could be presented against a "good / bad scale" defined in the form of a Param value for each performance metric that the User could alter from a base set of default values. Of course the gradient colors of the plots would go from red (bad) to green (good). For example, the default Param for Sharpe Ratio could be 1.00, and some Users might want to use .80 as a Param value where the gradient color starts changing to green. My two cents worth.
