Snapshot 13w09b came out today. Ton of bug fixes, and addition of /effect. So basically, that whole feature where you can customize beacons to give special effects they normally can't just got a ton more useless. It could still be useful if you want an effect to last a longer time than you can set, but it's distance limited and needs exposure to the air, while making that effect... Makes me sad, actually. Might become a forgotten feature.