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Actually, a script posted in more VX oriented communities, by bulletxt, allows to change tilesets and passability settings on a map-by-map basis. To accommodate using different tilesets, he also released a utility that allows to quick change tilesets, temporarily, in the program without importing.
I can link to his rpgmakervx.net topic, but you'd need to register: http://www.rpgmakervx.net/index.php?showtopic=13971