Hey, I’m not exactly the plugin author, but I might be able to shred some light on the the missing auto embed feature:
As of 3.5, Auto-embeds are automatically enabled and there is no setting to turn them off in the WordPress admin pages.
http://codex.ww.wp.xz.cn/Embeds
This is proberly the reason you cannot find it under Settings -> Media. It’s already enabled!
