For those who came by googling,
I made a small 3den Addon that adds a ModuleDescription category to the module window.

But would it be possible to have multiple formation leaders for flank/advance/stay back commands?

If you are playing purely with infantry,
1 (me),2,3,4,5 team white,
6,7,8,9,10 team red, flank left,
11,12,13,14,15 team green flank right.
16, 17, 18, team blue, flank left, flank left, advance.
19, 20 team yellow, stay back.

Short: The more units you have (in your formation), the less it makes sense if they work together in "your" formation (when they get those commands).
They are so spaced that they are more or less running alone.
And if I have to give each team every minute a move command - I can stop playing myself and simply stay somewhere in a base, dictating my squads per map.

At the moment flank commands etc. are only meaningful with vehicles.

I made once a script where AI got move commands on where I clicked, this way they got formation leader, and per script they always kept their destination relative to my position and formation direction.
Nice for Singleplayer gaming :)