as for having to heal when there is more than one mob.... I drop stoneclaw totems, generally keeps extra mobs off of my guys.

Since all my macros are based off off focus I use:

#showtooltip
/cast [target=focustargettarget,help,nodead,exists] Healing Wave; [target=target,help,nodead,exists] Healing Wave; [target=player] Healing Wave
*I modified Vyndree's shaman healing macro to use focus.*

which for me pretty much covers all bases. as long as my focus has a target, which he always should, all of my toons heal the guy being beaten on, if my focus doesn't have a target then they heal themselves. Also if my focus targets a group member they heal that member. So far it's working beautifully for me, 2 bars from 40 with no issues.