The current 'Attack here', 'Defend here' etc is just a game mechanic. It isn't visible to anyone outside your squad, because it goes with the attack orders for squad-level control. And its vBF2 grenades any how.
What I was referring to was actual coloured smoke like we had in Cretan Village in FH1. So you could call attention to an enemy tank by tossing smoke on it,
Set a friendly zone when calling in arty or air support by using smoke etc.
Just a small idea, let's move on to others...