http://youtu.be/qyzFkmp3G3c that's what it does on the latest snapshot
The powered dispenser dispense the lava cause of an update in front of it and don't stop until we remove the bucket from the dispenser. The dispenser act like a BUD but not only with redstone
13w09c
http://youtu.be/qyzFkmp3G3c that's what it does on the latest snapshot