@ftl :
I must admitt although this is the pvp-forum i don't realy PVP (actual i have a lvl65 pve group (pala,mage,warlock,priest,shaman))
So I must admit, there are no experinces with this setup for PVP.
The "modification" i made to the system was to don't use the '"targetless" option to save setuptime and to be able to use modifiers in my dps-makros.
I discribed it at: Focusless, targetless, 'leaderless' setup.

To specify a spreadout or turning you could perhaps also use the hotstrings/keymaps as you do within the ftl setup.

Little example for only 3 toons to get the idea:

You wanna do a line-formation bound to Key "f", move left is bound on every Toon at "h", move right at "g" :
h,g are randomly choosen, idealy you should use bindings for this, you actualy never hit on the keyboard)

Keybinding for ToonA:

f --> TOONA
h --> TOONB
g --> TOONC

Keybinding for ToonB:

h --> TOONA
f --> TOONB
shift+h --> TOONC

Keybinding for ToonC:
g --> TOONA
shift+g --> TOONB
f --> TOONC

This should result in:

TOONA leader & pressing "f" => TOONB moves left, TOONC moves right
TOONB leader & pressing "f" => TOONA moves left, TOONC moves right
TOONC leader & pressing "f" => TOONB moves left, TOONA moves right

remember: this is all from scratch, i never actualy used it, but i think in the basic prinzipal it should work...

Edit:
small correction: to get the behavior i wantet, changed on ToonB: g --> ToonC to shift+h --> ToonC, and on ToonC: h --> ToonB to shift+g -->ToonB
have tryed it and works like a charm
(although i'm not using g,h but LEFT-Arrow and Right-Arrow)