I just looked at the proposal, and it seems a valid extension of the restriction relations in my eyes, but you cannot call it a "directional node". The proposal would work very bad for things like benches.
For benches, you would need to add an extra node and an extra relation. That is far more work than adding a tag. And even with the extra node and extra relation, the use of "from" and "to" is still tricky. So I would support this proposal if it were limited to restrictions like "stop" signs and "give away" signs. But not for general nodes. For general nodes I would go with a direction=* tag. The values can be degrees (to be exact) or abbreviated directions like NE (North-East) or SSW (South-South-West) as shown here:http://en.wikipedia.org/wiki/Cardinal_direction#Additional_points .
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