Here's my setup, what i've used from level 1

I assigned ~ as my formation key

Player A = Up
Player B = Down
Player C = Left straf
Player D = Right Staf
Player Z = Nothing

My formation is a diamond is Player Z almost in the middle. I normally do it while Player Z is out in front so it's often in front of all of them.

Player Z is towards the middle since it spread out from Z player. It's not a perfect formation but does kinda give a line effect. I know what your after. You want a Perfectly straight line like Xbox's setup?

I read some where on the forums how to do it. I like the /walk idea. That just might do it. GL =)