What can we do to make ScottPlot better?
Waterfall charts:

Does your proposed feature allow users to do new things in source code? If so, show us how you'd like to be able to use the new feature:

var waterfallPlot = plt.PlotWaterfall(double[] xs, double[] ys, double[] yOffsets)

I am undecided if it should be done like above, or as an added parameter for PlotBar:

var waterfallPlot = plt.PlotBar(double[] xs, double[] ys, double[] yOffsets)

Check the ScottPlot Roadmap to see if your feature is already planned for an upcoming release:
https://github.com/swharden/ScottPlot/blob/master/dev/roadmap.md