Miles,
The toolbar is a tricky thing. Both the original edit toolbar and the toolbar that comes with the WikiEditor extension are coupled so tightly to MediWiki that
it's near impossible to integrate them into a separate application. What you're seeing in Papers of the War Department is a hack, which is fine since it's using a unique implementation of Scripto. I'm not at all comfortable releasing distributed software with a hack. In any case, it would break the Omeka plugin and could possibly conflict with Omeka's JavaScript environment.
Even so, we recognize that an editor toolbar would improve the user experience quite a bit. I'm currently looking into alternatives.
Jim