RGB Curve module - make it edit the whole curve

It seems this module works on a sort of [0,1] tone basis even though it is a scene-referred module. The upper part of the tonal range cannot be edited because it is off to the right of the display and so not accessible for placing control points.

It would be nice if you could edit the whole range. The histogram in the module would need to be for the whole range. Perhaps the x-axis might become too big with sparse pixels tailing off to the max in the image. Perhaps a math function could be used, log?, to keep the curve neat and manageable.

As the module stands, it seems it cannot be used for e.g. editing bright sky.

This suggestion originates from this post here - https://discuss.pixls.us/t/baffled-by-rgb-curve-module/54302/1

Start by locating the RGB Curve module and reviewing the linked discussion for the reported scene-referred behavior. Determine how the module’s histogram and x-axis currently limit control points, then define a manageable whole-range representation; done means bright and upper-tonal regions can be edited and the histogram reflects the full range.