I have two mapped keys for Death & Decay.

One of them sends the keybind to all of my DK windows (the DK ATG).
And it has a Send Next Click action, to all of the DK's too.

The other is set up to send the keybind to the ATG.
With the check box to round-robin, within the group.
And it also does the Send Next Click action, same target group.
Also with the box checked for round-robin within the group.
Because both the Send Keybind and Send Next Click use the same ATG, the order syncs up with both.
End result is a mouse-broadcast Death & Decay, for a single toon at a time.



You could use that for anything you want your toons to do in sequence.
One step will have them round-robin within the selected target group.
Rather than needing to have five steps, with a different target on each step.

If you were to mix and match toons.
You could add a tank and healer to the team/character set.
And just remove two names from the ATG.
Your round-robin within group (ATG of mages as the target), would work without further modification.

If you take a look at Aragent's thread (http://www.dual-boxing.com/showthread.php?t=42878), it attempts to provide macros for groups of toons.
You could put all of your Elemental Shammies into an Elemental Shaman ATG.
Do the same with all of your Balance Druids, etc...
And mix and match your teams however you want to do them.
Then have a generic keymap that applies to all of the teams (drag it onto the character set).
Or move the mapped keys onto the General Keymap, which also applies to all teams.
Then by virtue of being in the correct ATG, those toons run the correct macro or set of macros when you spam your DPS.



With all five being the same, there is less benefit from ATG's then if there were differences.
You might want to manually control one, and have the four slaves in an ATG; I could see this in particular if you were playing a 5x melee team, but did not want your main to IWT.

If you were to spec one Frost, and four of them Arcane... you might then want separate ATG's, because each spec has different abilities.

If I were to run 3x Frost and 1x Unholy DK's, with my Paladin, an ATG for the Frost DK's, which would round-robin Hungering Cold within that specific ATG would be a decent option.



In the past, I've experimented with two Action Target Groups for PvE play.
The team was, Prot Pally, Destro Warlock, and 3x Caster Shammies.
One of the Shammies was dual-spec Resto/Elemental, the other two were straight Elemental.

ATG A - Certain healing keybinds would go to all of my Shammies.
ATG B - Those same healer keybinds only go to the Resto Shaman.
Then have a two step mapped key for toggling my state.
Step 1 -- Adds all shammies to ATG A, and removes the Dual-Spec shammy from ATG B.
Step 2 -- Removes all shammies from ATG A, and adds only the Dual-Spec shammy to ATG B.

End result, Dedicated Healer mode = only that one Shaman does healing, the other two were straight DPS... receiving my one-button spam click castsequence, even when I pushed a button that would normally be a heal.... but DPS mode = all shammies were DPS, none are the dedicated healer, so Lesser Healing Wave and Chain Heal go to all shammies.