Lol, I'm guessing decadre hadn't gotten the latest update. What you describe is exactly how the new POI filtering works.
It is possible to define rectangles, arcs and elipses via XML but as Saint said... this leaves us with the issue of who defines the areas and how to provide an interface to allow that.
Would probably require some sort of drawing tool added to the web site that converted the shapes to XML EQ understands. Very complex stuff to develope and would seriously bloat both the server database and the generated XML files.
Its theoreticly possible, but HIGHLY unlikely to happen.
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