yes there is an option for the forward doors that allows you to fly with the door slightly open or with a wider angle open. If you look in the flight manual supplement 9.1-2 operation with door open and look on page 3 you'll see the airspeed limitations. on top of page 4 you have the part number for this "spoiler" option : "Use of EXTENSION pos. is only possible when the door locking device P/N B520M4023051 and/or B520M4022051 is installed"
fully extended your speed is still limited t0 30 KIAS but with the small angle (spoiler position), you can fly up to 100 KIAS.