What you want is Key Remapping, or whatever it is called in the software you are using.
Basically, you push something in the active window and it becomes something else in the other windows.
That way, you can leave WASD, QE, and the Arrow Keys on their default bindings.
But set it so that when you push "P", it sends W to one, A to another, S to another and D to the last.
For a line, you'd want two keys probably, or a two step mapped key if you can assign different actions to the same key on subsequent presses. The first will move two toons forward and two toons backwards; the second will move one of each in their respective directions.
You could also have a macro, where each toon (other then the front toon) auto follows a different toon, which will make your line.
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