I've been thinking about an idea. What if you could choose if your tank was a bit faster, but couldn't turn as fast, turns faster but can't move as quickly, or is just normal? You could expand that to having different teams have different characteristics, like red team moves faster,blue team turns better, green team gets a bit of both, purple team jumps a bit higher, rouge team gets a slight boost to everything. ( Of course, I'm getting a bit complicated there).
On the note of turrets- why not let players "plant" their tank. Then, you can rotate the turret, maybe a bit up, but not enough to become an Anti-Air cannon

. *Wings guy takes off* *Planted laser guy spots him* *KABOOM!*
the tank is immobile, can be squished, and be shot, but GM only, like BU. You would hit the button (say q), your tank burrows to the point only the turret shows, then the thing can be rotated. Pushing again makes you come up. It takes about 2 seconds to do so. It could be a server option, as well as the height you can move the turret up, turning speed, burrowing time, the like. I'm guessing it's a bit too complicated
The Pen is Mightier Than the Sword.
Okay, you get a Bic, the orc gets a long sword.
He cuts the Bic in half.
Then he cuts you in half.
Oops, I meant quarters.