"Strategic tag" or "Battlefield" game mode.

The game works like a tag game, with the difference that the first player of each team to reach lv 45 has the option to become a Strategist.
A strategist's tank will disappear and he will play by coordinating his team.
He can do that because his screen will be de-zoomed to cover the entirety of the map (he won't see the bullets, just the tanks, for order's sake and to prevent his browser from crashing), and he will be able to issue orders to team members by drawing arrows on the map (which the players of his team can see), and by issuing simple orders (go North/West/South/East, move to center, attack X position) to tank groups.

Tank groups are made of all the tanks in a (small) area, so if for instance there are two allied tanks next to each other, that's a tank group.

If there is just one tank, isolated from every other ally, that still counts as a tank group.

If there are ten allied tanks moving towards the same direction, that's a tank group.

He can issue orders to a tank group by clicking on it and picking an option - he will NOT be allowed to send free chat messages to his team members.

The other team members can either follow their strategist's orders or not - eight times out of ten though, following them will bring them advantages, given that the strategist can see everything.

That's all, I think it would make for a very cool concept!