spoken to das,he reckons that the changing of overlays with location needs a lot of time as overlays for each location and a graphics selector has to be made.So for the time being i reccomend put the top polled overlay and we can use this idea for the next update of the mega patch,dont worry it'll happen though.Pl keep voting meanwhile as there is definately going to be a time limit on the poll(s).
Siddharth