In my opinion the commander could have a lot more assets to make him more useful.
As of now, the commander can only do something every 15 Minutes and his options are very limited.
There are many option that would give the commander so much more options for the field for example:
-Cluster ammunition from an airstrike or artillery
-Laser guided ammunition from the drone or an airstrike (before the introduction of laser guidance) they could be aimed with a camera on the vehicle (the drone/aircraft).
That would give the commander more variety in his assets to attack enemy´s
-supply drops from a cargo plane, a cargo plane could fly over a FOB and drop a large amount of supplies, either chosen by the commander or premade, with a flight path made by the commander with the ability to shoot it down before dropping the supplies.
-calling in non respawning vehicle like: Tanks (only 1), light Vehicles perhaps with Tows/RWS or open top, supplies trucks or other vehicles map specific.
That way the commander could balance the playing field for example: if the team voted for Air assault and the enemy has an armored battalion and the team needs more armor or rather anti-armor vehicles, the command could call in another Tank or Tow cars to deal with them, the possibilities would be endless.