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That's exactly right. In effect if you specify 5 cells you are downloading 11x11=121 cells. (5 + 1 + 5)^2.
Ok, so I was thinking. Would this be helpful to you:
1. You se the zoom such that you see all of the area you care about.
2. Then say download everything in the current view with zoom from x to y, where x and y are user specified?
I think this would be a quick and easy way to download a large area. I will also make it multithreaded so that downloads go a little faster..
Mark
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