When in a duel, we can overload the opponent's alert system by attacking with weak units (ie 1 fighter) on slow approach and recall on the last minute.
We use a few lanes for that, but the opponent's alert system is always flashing, inactivating it, and driving him crazy.
This leads to an alert system exploit, already in effect:(

You could upgrade the alert system leading to this.
One could "mute" individual lanes from generating an alert. There should be an unmute button in case of a mistake, like muting the wrong lane.
Enemy lanes should still be around for checking, but alert counter should decrease by 1, and stop flashing when it gets to 0. Mute should be disabled when counter is 0.