I think there should be payment options in the Tanki Online shop, like you could pay real money or you could use tankcoins. Also add everything that is on the pc version shop to the mobile version shop.

A rocket rail sniper, not quite the railgun, shaft, or the striker, but its a little bit of them all.

A drone turret but that player cant have a drone of its own. It would deploy air drones and ground drones. Like 5 of each. The ground drones could not fall of edges or flip upside down and the drone could not hit the wall, so it would have to sensor the wall or it would have to target the closet enemy.