GSX has a special feature, which is in fact the "Chock as brakes", but there's on user interface for it in the airplane customization page, we must add it for each plane in the GSX internal database, and we did for some airplane like PMDG, Aerosoft, FSLabs, Leonardo, but not for the TFDI 717.
We'll have a look at it, and we'll try to add it for the next update.