@dimention: thank you, happy is working good for you

@Reaver8005: The CC has no way to tell if the tank teleported out of the dungeon or just teleported to the next room. the only thing you can do is "disable Beacon" (i do not remember if is available in dungeon setting) and cast beacon of light by yourself

@wooinau and all the discussion: That's IMVHO the wrong way of using selective healing.
You want your tank to be healed more then the other, fine, that's what "Healing tank priority" and "Multiplier" are for.
Selective healing is a big bad butcher knife while you need a sharp stiletto for the raid job most of the cases.
Try setting "Healing tank priority" to 100% and "multiplier" to 1 with selective healing OFF and see if that help.
Also this CC was programed with a Crit/Spirit set in mind, meaning all your pieces of gear should have Crit/Spirt or be reforged to have Crit/Spirit.
This is because Haste is a mana burner AND increase overhealing.
Why do not use selective healing?
Because of beacon of light. Since it copy 50% of all the healing done to anyone else on the tank every heal NOT on the tank will heal for 150%
This means that your healing meter will skyroket.
Ok, but to not let the tank die there is Healing tank priority and multiplier. with setting of 100 and 1 this means that the CC will heal someone that is not your tank only if that someone has Half or less the health percentage of your tank.
@Dubbelu: happy is working good for you
What this CC do best? healing 2 tank at a time.
If you are in raid and you are assigned to heal 2 tanks then select tank1 as tank in lazy raider, turn on "ignore beacon" put by hand beacon of light on tank2 put "healing tank priority" to 100 and muyltiplier to 1 and see the magic

At least when I raider i used to heal like this
@JeffKing1989:
1: multiplier is a multiplier, multiplayer at 0 means "do nothing"

Change multiplier to 1 and play arond with heal tank priority, try it at 100%
2: well man if your party cannot stay out of big AOE and the CC has to heal them back to 100% what to you expect? that heal witout using mana? ^___^
3: i'd try 5, do not go above 7 and remember that only work with IntellyWait and not with any other casting system
4:Spirit!! a loooooooooooong way.
Idealy you want Crit/Spirit on every piece of gear.
@15outland: you are Horde? that's just normal, man.
It target your enemy and heal your ally, no reason to target someone you need to heal, she just do this internally.
look at recount or at the log and you will see that the CC is healing your ally around you, WITHOUT targetting them.