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That is a rather horrible hack! It'll probably work, but in terms of data structure it's not good - which generally leads to long term headaches. We've built a number of systems that function as the back-end to multiple sites. Likewise content served in different languages presents similar challenges (or for ultimate fun: several sites in several languages leading to 12 pages per item!).  I would always have this data served in separate fields. The easiest way to imagine this is that you had either a separate copy of that form for each domain, or 2 columns in the form with domain A on the left and domain B on the right. Presumably in your example, the details are separated out at the point when the page is rendered. It's messy, it suggests to me a developer who is constrained by their understanding of the platform that they are working on. However, it should work.

Oh, just spotted this video that refers to your question: watch?v=421aTJI2Nxc

Xnumrtik pointed out a very important aspect here. Associating your website in GWT with one country will definitely boost your rankings in that country, but it will have no effect on your SERPs in another country.

Stephen, Open Site Explorer does not crawl as "deeply" as Google. It hits roughly the top 25% of the web and therefore will not show everything that you will see in GWMT. Obviously, to have that type of depth would require a lot of bandwidth and servers and that is what makes Google, Google.;) Also, it would depend on when your links were established as it can take up to 60 days for OSE to show the links. One thing you can do is check when the last crawl was by moz and compare that to when the links were created. I believe the last one was Sept. 12. Here is a post by Rand regarding the August mozscape crawl  which will give you a lot of info as to what is crawled, etc. Hope it helps,