The reason your playing all the same class for dps is to reduce twitch.

Your might be introducing more "twitch" than is needed into your frost mages. Just use someone's '/use /use /cast iv, /pet, /cast frostbolt' and tie that to assisting your tank, maybe another button for assisting your healer if you want to quickly toggle between targets.

If you really want to keep ic/pi/mi separate tie them all into a 'itsgotime' macro and have your shaman do the same with heroism/bloodlust and your paladin with avenging wrath. and then you can pop that when you want. You also want a round robin counterspell, "prep" manashield, "chug" /use gem, /use crappy potion.

I think dpsing the two mobs separately might might a mistake. Where you would have a toggle setup between the assist of your tank and healer for example ever other frost bolt.

I'll have to setup on a dummy, but I am sure this adds some significant delay, though I am not sure really how much I did this trying to get rid of lava burst x4 overkill on mobs, but it looks damn cool. You surely want no delays when under heroism/bloodlust or iv/ap/trinkets.