Fairly simple idea. Squad leaders would be able to cert into an aerial flare for temporary night time illumination. 5 minute cooldown. Activated on the map screen similar to rally smoke. Launches a flare several hundred meters into the air that slowly descends over 30 seconds illuminating a large area. Useful for revealing enemy positions during night time low light conditions.
I'd like to see that, but a 30 sec. duration with a 5 min. cooldown seems pretty useless. If it lasted 2-3 minutes I could see it being useful. Also - immersion.
I figured 30s would prevent continual flare use during large battles. If you've got 48-96 defenders and 48-96 attackers that has the potential for 10+ squad leaders. I like night time effects and limited visibility.. I also play on PS4 so tweaking settings to break immersion just for an advantage isn't a thing. (Games better for it too) The flare would be a tactical use item. Like popping 1 off before making a duster lib run over a massive battle or illuminating an enemy sunderer swarmed with infantry. 30s is long enough to make use of but short enough to have to consider using it at an oppourtune moment so you don't just waste it. 5 minute cool down could be too long, but again, makes you think about if you really need it right now or not.