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Yes the keyword rankings tool tracks any URL within your domain for rankings on those keywords all under the same campaign.

There's no way that I know of to adjust the frequency of their crawl. I'd put in a call to support about this. You'll get a much quicker response from SEOMoz staff there than you will here.

You can look up the site in the Open Site Explorer to get the information you're asking about. Then you can either compare in your browser or export to cvs for spreadsheet analysis.