Another possibility is somewhat radical: - Non-routing or "decorative" ways for sidepaths.
The current highway tags are quite good for routing a pedestrian or cyclist from intersection to intersection, and thus over any reasonable distance. However there's a desire for what amounts to drawing pretty lines on the map: modelling the details of the sidewalks and sidepaths. In suburban areas that often means a winding sidewalk next to a major road. In many places the definition is fuzzy, as there are all variants from fully separated to right up at the curb. Maybe splitting routing tags ("how it connects") from rendering ("how it looks") has merit.
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