Provide more flexible Fill Color Filter Range setting

[dkp]

Although I can see at a glance that the range has changed in the color bar, the images all LOOK exactly the same.

This, I suppose, is because you have cleverly set the range of values to be perfect for each dataset.
What I want (I think) is greater flexibility to set the range of values in the choropleth viewer.
If I could set multiple panes to be the same (e.g., 0 to 8.6), then it would make visual comparisons easier.