Please add a pure Gamma Control to the Curve tool.
It would be very helpful to have a Gamma control (plus or minus) near the end of the pipeline. Currently, we can crudely approximate this with the mid-control in Levels, but it is not consistent if the black or white point has been adjusted in Levels. This feature would be most useful when processing scanned or negative images.
Current workaround
Currently, my workaround is a collection of Presets that implement a range in small steps.