It would be nice to have Tolerance Interval and 3sigma Error Bars in the Points Element of Graph Builder when the Summary Statistic is the Mean.
Similarly to "Set alpha Level" the "Proportion to Cover" could be selected via the red triangle menu.
Instead of having only 3sigma Intervals one might have k-sigma Intervals and supply k via the red triangle menu as well.
There may be ways to calculate such intervals first and then use report tables in Graph Builder to construct intervals from lower and upper limits, but via the Points Element it would be much faster and it would be easily possible to show raw data and e.g. tolerance intervals for these data at the same time.