It seems to me that there are different objectives which are sometimes overlapping in this proposal and the various discussions around it, which are quite interesting. I think it might help to gather those objectives and have a look if this proposal or some of the other ideas is a solution for this.
Just some of the objectives I gathered:
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“Dangerous paths” shouldn’t be part of highway=path, as secondary tags aren’t enough for non-hiking maps/routers to render them appropriately; so a disruptive new highway=? is needed.
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Scrambling parts of hiking trails should be mapped, so we need a tag for that.
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The definition of highway=path is too wide, so every small solution is a step in the right direction
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A new value of a highway tag should be so obvious that misinterpretation is rare
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The state of path related tags is alright, data consumers are the problem, nothing to fix here
Of course the list is longer (or I’m not quite getting everything), what I want to say - highway=scramble (or something else) can’t be the solution of all of them, and it would make it a bit easier to solve at least one thing if the discussion would more about objectives than semantics.