Ive had the perk many times now, it does nothing. The distance you start from the enemy seems to be connected to the size of the battle, you will notice the more looters in the stack the further they are at the start of the fight.
What i would like to see in the finished game is a pre battle menu where you can create groups from your army list if you like or set up pre set groups that auto fill to set %s of a chosen troop type eg... "Archer Group 1 = 70% of my armies archers" and "Archer group 2 = 30% of my armies Archers" and then the ability to deploy these forces onto the map before the battle starts. Unless they add an ambush mechanic and you get ambushed, in which case they should be able to set up right on top on your army in a stupid colum formation.