Okay, I'm looking at the airport editor. Indeed, I see that the options "no stairs" and "no bus" are checked by default.
They surely aren't, by default. If they are, it's either this case:
- You checked them
- The scenery developer has set it that way
This can be easily check by reading which filename GSX is using for its customization. If it's an .INI file under %APPDATA%\Virtuali\GSX, it's a modification you made. If it's inside the \Scenery own folder, GSX will tell it's a "Designer-provided data", so it has been made by the scenery author.
But I assure you that, by default, GSX has both the "No stairs" and the "No bus" options DISABLED.
Please, what's the reason for all this, how come GSX at a gate that doesn't have a jetway check the no stairs and no bus options?
As I've said, only because either you or the original scenery developer has said so in a GSX custom profile.
- The "No stair" option is used only to disable the REAR staircase, the one normally used by cleaning crew, which is more common practice in Europe rather than US so, I'd say European airport usually should have it un-checked, which is how GSX works BY DEFAULT.
- The "No Bus" option is quite rare, and should be used only at those airports with gates that have no jetways, but are so close to the terminal, that passengers will just walk after going down the stair, so there's no need for a Bus.
Normally, a gate with a Jetway should have both option disabled ( which, again, is how GSX defaults to ), because if GSX detects a jetway ( either standard or SODE ), it will never create stairs (except the rear one), and it will never create a bus.
Assuming the setting has been made like this by the scenery developer, it might be because:
1) they don't understand what those options really do, that the "no stair" only relates to the rear stair and the "no bus" is useless, if a gate has a jetway.
OR
2) they made a mistake in the SODE XML that creates jetways, not flagging the jetways correctly, which results in GSX not detecting them ( they must match 100% the name of the parking in the AFCAD ), so they thought it was required to explicitly tell "no stairs" and "no bus" to GSX, to force it to detect a jetway which was flagged incorrectly in the SODE XML file.