Begins moving the player character forward while steering via mouse movement. After calling this function, the player character begins moving forward while cursor movement rotates (or steers) the character, altering yaw (facing) and/or pitch (vertical movement angle) as well as camera position.

Equivalent to calling both CameraOrSelectOrMoveStart and TurnOrActionStart without calling the respective Stop functions; i.e. holding both left and right mouse buttons down. Used by the MOVEANDSTEER binding, which can be customized to allow alternate access to this action if the player's system does not allow pressing multiple mouse buttons at once.