Richard,
It is definitely possible to edit the about screen that is displayed when you click the about link in the HeaderControllerWidget. You can find it in the documentation here: http://resources.arcgis.com/en/help/flex-viewer/concepts/index.html#/Header_Controller_widget_tags/01m30000000n000000/
under the links section. You do have to write a little HTML code if you want good formatting.
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