Currently, magento-extension is a synonym of magento. So I regularly see people creating questions tagged magento and extension - normally I would retag them to use magento-extension instead but this tag is unavailable. I have to remove extension as essentially meaningless instead, not really a great solution.
Is there a reason why these tags should be synonyms? There is a fair deal of Magento questions dealing specifically with extensions, so useless fragmentation cannot be it. Can the synonym be deleted to allow creating magento-extension as a new tag?