Great suggestion, @zkarj …
1) New check-box in the Color/B&W Rendering panel …
2) New option in Preferences … on the Display tab;
To have NR always applied to the image (rather than only within the Loupe)
3) New scale (and label) for the Intensity slider on the Lens Sharpness panel …
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PLv8:
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PLv9:
… which brings the Intensity slider on this panel in-line with all(?) others elsewhere.