I have all 5 of my shams spec'd elm

I have 2 buttons for lighting and heal... button 1 LB's my focus target and button 2 flash heals my target's target on my main and LB's my target on my slaves.

you need this setup because of the delay on target switching on your adds can be one or two seconds and in heroics that could kill killed in that time.

on a pull I start of with LB, then CL and continue to LB x5 until the enemy is in melee range and is hitting someone, you should be able to take down 1 or 2 mobs in trash pulls. then switch to LB + LHW. and make sure you're targetting the mob that you know hits the hardest, this will usually take a few wipes to learn.

The lower city prayer book is invaluable for this setup becuase you rarley run out of mana on a trash pull or boss fight + the imp LHW from the nagrand animal killing spree will give you that extra boost. altho when spellpower is introduced in a few days you'll see a lot better healing with old dps gear

I've used this setup in every heroic except the 2 I can not clear, BF and AC