The current Burnup report has an ideal burn rate guideline. It is based on the current total story points.
We would like to see an "original burn rate" guideline based on the original total story points. So if we started with 128.5 story points, the guideline would be based on that.
Since some will want it and some won't, perhaps a check box on which guidelines to show.
See attached picture. The "original burn rate" guideline is shown in blue. It shows that we surpassed our original story points, but because we added scope throughout the iteration, the ideal burn rate guideline (in gray) moved.
