First off I like this proposal and agree that it be applied more broadly. However there is a difference between a motorway=link (and similar) and a footway=link. A motorway=link is a physical feature unlike a footway=link. A footway=link is more of an attempt to bridge vector representation of a footway and how it connects to a vector representation of a road. In reality, they are adjacent features. If highways=* were drawn as areas, we wouldn't need a footway link but still need a motorway=link. Then there is the question of how footway=link should be rendered. I would be happy with a dashed gray line to indicate that it's just a connection for a router.
Best, Clifford -- @osm_washington www.snowandsnow.us OpenStreetMap: Maps with a human touch
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