By quickly tapping right then left mouse click, within a split second, the game will act as though it is continuously receiving a mouse click input.
When this behavior is in effect and a player exits a ship they will not be able to move (without moving the mouse firs)t but the astronaut will act as though receiving move input from the qweasd keys. Reentering the ship while in the stuck state will resume the continuous fire within the ship.
Moving the mouse in any way will stop the behavior, mouse wheel will also stop the behavior. Holding down the either left or right click will cause it to act as though no clicks are being pressed. Sometimes clicking at the right time without mouse movement will stop the behavior.