The basic idea with IS Boxer, is to run unique (similar) mapped keys for each toon, when they become leader.
The only things that matter, is ending up with only one toon per action target group, on the switches; and having at least one group for each toon that will be moving for the formation.

In my case, with five boxing, I have the other four toons join an ATG each.
Which lets me to any formation, where the active toon does not move, but the other four do.
If you wanted a formation, where all five moved, you'd need an extra ATG and to place the active toon into that one.. not that hard of a modification.

Then its just one mapped key per formation...
My only mapped key for formations is to spread out, NW, NE, SW and SE.
But the principle is the same, use the movement ATG's as the target, and broadcast the desired movement key to each respective target.
The movement keys are then at default settings within wow, for all toons.