Can you please explain? This has never been an issue (in fact a lot of sceneries work as described). And for AI purposes it is does not matter. AI looks at radius, type and parking code. Also for other add-ons it does not matter a lot. GSX can be fully customized and I don't know any other add-on that might conflict.
And if Asobo would allow stairs at gates (small, medium, large) this means that also at gates WITH jetways stairs would occur.