I play a Priest, Warlock and 3 Mages. Playing all squishies I've found CC to be very important . My Priest is the main. I target a MOB with the prist and use Alt-F1-F3 to set focus with the appropriate Mage using the following macro (changing the target icon):

# RaidTarget = Orange Circle
/stopmacro [modifier:ctrl/shift][nomodifier]
/script SetRaidTarget("target",2)

On the Mages their F# key is this macro:

/target [group,modifier:alt] party1target
/focus [group,modifier:alt, target=party1target] [nogroup,modifier:alt,target=target]
/cast [target=focus,nomodifier,exists] Polymorph

I know the target isn't mechanically necessary, but I do it so I can see that they each have a focus target when I'm done.

I also map this to the Q key, so they can all poly at once, or they can do a round-robin based on the main's targeting:

/castsequence [target=focus,exists] Polymorph; [group,target=party1target,exists] reset=combat ,,Polymorph; [nogroup] Polymorph
/focus [modifier:alt]

Hope it helps.

zadhi