You mean like, "Hey why can't I step on this forest tile?" *Hits A* "Found cool item!"
Exactly! Wouldn't that be cool?
My only guess is that the dialogue screen never comes up ever on the overworld. It probably won't work the way you expect.
I Didn't even think of that... My concern was that there are no chest-type tiles used in the world maps. If you try to assign a treasure to, say, a staircase in a location map, it doesn't work... In theory there would have to be a way to change the ASM of tiles so that a world map tile functions as a chest.
Is the world map any different from the field? Is the world map basically a stripped down version of the field, where you can only access the menu, get into random battles, and go to field events (where almost all of the story happens)?
One thing that is definitely true about the Overworld map is that it is 64 times the size of any location map. Given the hardware limitations of the SNES, I'd wonder if the game had enough RAM to load a world map that had all the interactivity of a location map...