I replaced all of the jetways on my own as my YVR afcad has current gate numbering as well as a ridiculous amount of customization for AI etc. The issues I see though (besides the lack of AI awareness) are not having the ability to adjust the height of the jetway to match the scenery and odd angles where the base of the jetway doesn't properly sit up against the terminal.
Still though, having GSX not just delete other airport files even if they are outside of the airport's scenery folder would be nice.