So the idea is quite simple. Make it so that a plugin can be updated by others too. Why? Because there are some plugins that are just too awesome to stay inactive. (@aliuly is no longer active, but his plugins are very nice) Or some plugins need to be updated (String -> StringTag), but the plugin author is inactive. I am not sure how this could be done on XenForo though; maybe you still can submit as if it was a new plugin, but it will be put under that plugin as an update.