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ohhhh you mean this? I think it's for fine adjusting the lever feel, and maybe allowing the lever to pull cantis as well as Vs - closer to the pivot is canti (pull ratio changes as you pull), further from the pivot is vee (pull ratio is basically linear). same mechanical principle as the pauls levers with choice of two pivot points.
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Looks like a version of servo-wave https://bike.shimano.com/en-EU/technologies/component/details/servo-wave-action.html fiddling with the pivot point really does change the brake feel.
I didn't think it was. Thought that the little allen adjuster in the usual place was for that. Will have to find an old manual online or something...