First of all I use AES and when I receive the Jetway I still get a stairway from GSX to at the L1 door.I know this has something to do with the airport customization but I can't find a way to create such thing.
This has been discussed in many other threads, and we are working on an update, that will allow you to specify parking by parking which one have fake/static/non-standard/AES jetways, so GSX will not call stairs.
We'll also put a global switch to always *ask* for stairs if there's no jetway (no _standard_ FSX jetway), in case you don't have time to customize.
Secondly I only receive one baggage loader instead of two. Only the after compartment is being unloaded and loaded by GSX but the forward one stays untouched. I fly the PMDG NGX.
Front cargo has been discussed in many other threads too, it's not supported right now, but it will surely be added in a future upgrade, together with cargo pallets loaders for the larger airplanes.
Third little question regards the pushback. The pushback truck and wingwalker stay right in front of the airplane after disconnection. So I can't start taxing only after about 30seconds they move aside.
Pushback sequence has been also discussed in many other threads too, and we'll surely improve that one, having the wingwalker clear the area sooner.