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Answers
More or less the same question crossed my mind when I found out that we'll have to wait for 'reader only' access. The source is available, in a sort of Russian doll affair of nested archives, and you can alter and rebuild it using JBoss plugins for Eclipse, but this is a JBoss application and you'll also need to know what the rest does.
In you server deploy folder look for a rapidminer ear and peer inside, you might also want to check out the Indigo link at http://www.jboss.org/tools.html .
What a treat!