It has been discussed many times already here.
The next update will allow to select the ground operator manually. Next one after, should include de-icers. And there will be many smaller fixes that were suggested on the forum, like straight pushback option, free positioning from the parking, etc.
About visible Passengers, there's a blue box in the GSX manual (was made intentionally this way, so none could miss it...) that explain the issues involved. Passengers are surely in the future of GSX, but probably not for the current generation.
