When I was one-boxing a Warlock through T5/T6 Burning Crusade content, I had these two macro's - bound to my forward and back mouse thumb buttons.

Primary:
/clearfocus [target=focus,dead]
/cast [pet:succubus,target=focus,harm]Seduction; [pet:succubus,target=mouseover]Seduction; [pet:voidwalker]Suffering; [pet:felhunter,target=mouseover]Spell Lock;[pet:felhunter]Spell Lock;[pet:felguard]Intercept

Secondary:
/focus [pet:succubus,harm]
/clearfocus [modifier:alt]
/cast [pet:felhunter,modifier:alt,target=p_layer_]Devour Magic;[pet:felhunter,target=mouseover]Devour Magic;[pet:felhunter]Devour Magic;[pet:voidwalker]Sacrifice;[pet:felguard]Cleave

The focus clears when the target dies, or when the secondary macro is pressed while ALT is held down.

Primary:
Voidwalker - Taunt.
Succubus - Seduce Focus or Mouseover target.
Felhunter - Spell Lock target or mouseover target.
Felguard - Intercept.

Secondary:
Voidwalker - Sacrifice.
Succubus - Sets or clears Focus.
Felhunter - Devour Magic on current target or mouseover target or with ALT key held on the warlock.
Felguard - Cleave.