Yeah, I can’t keep my mouth shut, can I? 
It was this one: [Suggestion] Simplify Tone Equalizer - #104 by pedrorrodriguez
But there the request was different, I think: instead of having to use the contrast and exposure controls to position the range of interest (the whole tonal range, or part of it) into the -8 EV … 0 EV range, somehow specify the ends of the range one is interested in, and the tone EQ would rescale everything to fit that that selection.
Here, my experiment was to enable the contrast adjustment for all modes, a smaller change.