Add 'pipette' tool to Image Texture Editor (and others) / hotkey discoverability

The 'sample' or 'pipette' (or eyedropper for barbarians) hotkey is "s" in the Image Texture Editor. "S" for sample.

Is there anywhere in the UI that a user might 'discover' this hotkey?

If not , I suggest that, if a pipette were included in the toolbar of the Paint editor, that would be the logical place to include a hotkey reminder for users to 'discover'.

If there IS a place to find that out, besides "magically knowing it from years of Blender use", I suggest it be made more conspicuous, because it's not obvious at all: even the one pipette I was able to find --in the color picker AFTER you've clicked on a color swatch-- doesn't list "s" as its hotkey.