When you launch DayZ, the game is only able to be started with a controller. Once the game is launched, at the bottom of the screen it displays a statement that says "Press 'A button' to start the game" even after moving the mouse or pressing a button on the keyboard you're unable to start the game with the keyboard, you must power on your controller and press "the A button". This is an inconvenience for players such as myself that don't use a controller to play the game.