This still doesn't work at Aerosoft's Heathrow. L2 is now preferred exit but jetway still goes to L1. This makes it totally unrealistic as BA at LHR always use L2.
Checking Aerosoft web site, that scenery uses standard CTRL+J jetways, so nothing in GSX controls, affects or change anything on a scenery that comes with standard jetways.
The "Preferred Exit" is a concept that is known only to GSX, so it only works with GSX L2 jetways or SODE jetways, but the default animation system for standard jetways doesn't know anything about it. Default jetways will always go where the main exit is set on the aircraft.cfg
That was the main point of SODE and GSX L2: to have a better jetway system but, sceneries must be made for it and, while we replace all standard *default* jetways at *default* airports automatically, we don't do that for 3rd party sceneries, it would be both wrong and very risky modifying other developers sceneries automatically.
But of course, GSX allows you to create an Exclude file to remove all standard jetway from a 3rd party airport, and replace them with GSX/SODE jetways, so they will work much better, allowing for double/triple jetways at any gate, respect the Preferred exit, use the GSX custom Stop position, use the GSX L2 Animated Passengers, etc.