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Andy, I've seen this posted as an idea, and some Tableau folks asked a few questions at the time. But I never saw any hint that there was a hack, or hook to get at this to make it changeable.
Andy gave it a +1. Your link is broken. This happens for all Idea links unless you switch over to HTML (last tool on the tool bar) and paste the link there. So here it is: http://community.tableau.com/ideas/1813#comment-3182