I just received a response back from Your Europe Advice (http://europa.eu/youreurope/advice/index_en.htm). Their response was very long, and contained a lot of helpful information. Of particular interest was the NOTE section at the bottom. I will post the majority of the response here, with personal...

We have a remarkably similar case to jbminger, and I've spent the entire bleary-eyed day trying to work out our rights on the point of being a dual citizen. I'm a British/Irish national, have not yet exercised any treaty rights, but planning to move to Dublin for upwards of 3 months, then return to ...