I've been looking at the video's for this,and I must say,it looks good,as for the gateways,you should be able to manual operate them?
As was explained right from the start when GSX was first announced, GSX will not handle jetways in any way, since they are already provided by FSX so, any proper FSX scenery should already have them.
Proving moving jetways for the 3rd party airports that don't already have them, requires interacting with all different developers (some of them even openly oppose to this) and it would require doing manual work for each airport, which will result in having to charge separately per airport, and will tie us into supporting every single airport.
We'd rather work on adding new features to GSX that will apply to all airports at once instead.