tedster - 8:49 pm on Jun 1, 2009 (gmt 0)

Before I researched this question, I also thought that GWT targeting would affect more than "radio button" or Advanced Search results. However, one issue that may get folded in here could be a LOSS of rankings in the other areas of the world that are not chosen.

I'm guessing that Google feels their "existing information" (and that includes the IP address) gives all the localization information they need for regular web search results, at leat for now.