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I don’t know.
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SIDEWALK spawns a bunch of sidewalk tiles at any connection point between a map and road.
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“extras” tells the game how to spawn things like minefields, drug deal remains etc… If you set “extras”: to “field” on a building map, extras might override parts of the map, creating things like weird minefields inside buildings. See homeimprovement_superstore for an example.
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I think a few maps in chaosvolt’s Arcana mod have artifacts in them. Nope. If you’re okay with non-random homemade artifacts, you can make you’re own using the same method Random_Dragon is using in Arcana.