Additions to that page, I'd think, should be proposed separately. - The utility undergrounding RFC proposes tagging for a similar "regional default value". http://wiki.openstreetmap.org/wiki/Proposed_features/Quickly_Marking_Utility_Wires Eventually the tools will catch up :-)
But that case is simpler. Smoking rules depend on the area AND the establishment type: smoking_default:yes=restaurant;cafe smoking_default:unknown=bar And the legal definition of the restriction may not mach OSM's definition (e.g. smoking maybe allowed in certain bars owned by people who donate money to a particular party ;-). I say the definition of the tag should simply state that legally mandated smoking status should either not be tagged at all, or given *smoking=per_local_law*.
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