Yes, it has been discussed many times already, and the most sensible solution is to ask those 3rd party developers that still insist making sceneries with static jetways, to realize it's 2015, and there's no excuse to leave that feature aside.
We'll likely work on jetways and improve them in a future GSX version, but only for our airports and/or 3rd party airports that use our scripting engine, like Flightbeam.
Adding jetways to 3rd party sceneries that don't have them already, would require charging per airport, which is a business model we don't agree with.
