Hi,
I have a few suggestions for GSX that might enhance the realism.
1. When the weather is rainy or snowing perhaps the marshaller can be adequately dressed?
2. When flying business jets, perhaps instead of a bus pulling up to the aircraft, a limo/luxury car can be selected as an option?
3. This may have been mentioned previously, but when pax are boarding, they don't have a sense of time. It's always "good morning"..
4. This might be a complicated option, but perhaps a means of controlling the pushback process manually by means of a small interface? At some airports there are tricky spots that require a unique pushback procedure and it would be nice to always have a means of doing this correctly.