I was interested in this as well, trying to find a way to use 3 different keys to move a character.

It seems like only 2 keys are allowed to be set based on whatever I understood in the API.
http://www.wowwiki.com/API_GetBindingKey

And the Movement Functions are protected
http://www.wowwiki.com/World_of_Warc...ding_Functions

(Hmmm Idea) I wonder if I could use Keyclone's Keymap and Hotstring function/feature.

Main Character:
(k)S = Strafe Left.
(k)F = Strafe Right.
(k)F10 = no keybind, do nothing.
(k)F10 = (hs)all.Formation
(k)F11 = (hs)all.StrafeLeft
(k)F12 = (hs)all.StrafeRight

Clone1:
(k)S = Strafe Left.
(k)F = Strafe Right.
(k)F10 = (hs)all.StrafeLeft
(k)F11 = (hs)all.StrafeLeft
(k)F12 = (hs)all.StrafeRight

Clone2:
(k)S = Strafe Left.
(k)F = Strafe Right.
(k)F10 = (hs)all.StrafeRight
(k)F11 = (hs)all.StrafeLeft
(k)F12 = (hs)all.StrafeRight

In theory (I haven't tested this since I'm still at work), when the Main presses F10, Clone1 will do F11 (Strafe Left), and Clone2 do F12 (Strafe Right).

Does it work this way?