The walking passenger inside terminals is just the core technology that will allow us to eventually have them in GSX too. But it must be integrated properly with the scenery editor, since those paths will have to be customized for each airport and each gate, like a custom pushback, but possibly even in the 3rd dimension.
When GSX will have it, available to customize every airport, it would be fairly easy to add them at Basel and other airports that might require it.