since new update I have to use mouse and keyboard for control why ?
This version completely revises the ground vehicle system and alters mouse function within the game.NOTE: The mouse cursor will only appear and function when the clipboard is active or when the radio bar is open.Your mouse now defaults to mouse look when you are piloting a plane or to gunner control when you are in a gunner position. You can toggle mouse look with <Shift M> or disable or enable it to default on in the Options/Preferences/View Options menu. This may not be defaulted on if you have modified your View Options in the past. You can also set the sensitivity of your mouse look in this menu. Gunner positions can now be controlled with either the mouse or the joystick. Both controls are live at the same time so you don't need to switch modes to switch controls.Vehicles are now controlled with the W, A, S, and D keys. This allows you to be able to completely control the vehicle while manning a gunner station. A and D controls left and right turns and W and S controls acceleration and deceleration. Holding down the S key will also shift into reverse. Pressing <Shift W> will accelerate your vehicle to full speed without having to hold down the W key. Pressing <Shift S> will bring your vehicle to a full stop. Gear shifts take place automatically.All tanks with turrets and tanksights now have a commander's position in place of the driver's position. The commander's position can use the mouse or joystick to slew the turret. Vehicles with commander's positions can only attach a second player as an observer and not a gunner.Added new tank sights. The German and Russian tanks are using sights with adjustable reticles. You can dial in the range of the sight using the C and V keys or the mouse wheel if mapped. Different tank sights have different magnifications and field of views. Most tank sights are a single fixed power but some tanks (Tiger, Panther, Firefly) have a second maginification range that can be toggled using the zoom (Z) key.NOTE: Your mouse buttons will not be default mapped if you have remapped your joystick in the past. You can map your mouse buttons in the control mapper.NOTE: The vehicle, gunner, and chute keymaps have been reset to the new default configurations. If you remapped any of these keyfunctions in the past, you will need to remap them again
guessing you didn't read the release notes on the update: