Politely: Your suggestion for the rear stairs once again evades my issue- I DO NOT WANT to have to 'adjust' for no rear stairs at EVERY USA AIRPORT I fly the 737 into or out of!
Not doing ANY adjustment to the airport customization, will likely cause much bigger issues that the completely harmless appearance of extra rear stairs sui, things that affect the simulation like:
- wrong pushback in restricted places where the normal Left/Right strategy won't work
- vehicles clashing into each other because their starting position conflicts with scenery ground objects
- invisible Marshallers because they have been placed too far into a terminal building
- wrong parking radius set in the scenery, resulting in the default vehicle placement too close to the airplane
Each one of them can happen, if you don't customize, and they are way more problematic than seeing an extra stair on the rear door.
That is to say, you either DO your own customizations, and in this case disabling the rear stairs on parking with jetways would take a really minimal amount of extra time compared to the other way more important things you need to set, or you DO NOT want to do your own customizations, preferring to rely on pre-made customization files made by GSX profile creators which, of course, knowing that rear stairs are not used in a particular airport, they would already set the option in their profiles.
Now, I wrote this trying to make you aware there will be far bigger issues you'll find, if you don't want to do any customization or don't want even to check if an airport has already a custom profile made by the community, the rear stairs is really irrelevant, compared to the others.
That doesn't mean we won't consider adding the option you asked, is not really difficult, but the way you asked it, seemed to indicate you are expecting to use GSX and ignoring ANY form of customization, which is not always the case.