Free Room and Space Insertion Point to Centroid Add-in from Case (Updated)
"Have you ever wanted the insertion points of your rooms or spaces to sit at the exact calculated centroid of the room automatically? This will make it easier to get your room tags at the exact center of the room when automatically tagging. There's really not much else to say about this tool, pretty simple actually."
There's more information available on the Case Apps website.
Update 5/8/2016: CASE and the CASE Apps website are no more but, courtesy of WeWork, the CASE Apps are now open source. They may be accessed on GitHub.