1) Would it be possible to update the ground crew animation, for example when connecting and disconnecting the towbar? For example, that the hand of the person is actually touching the towbar handle?
Of course it is. Have a look at the new Fuel Hydrant animation, to get an idea where we'll going.
Also, when the big pushback truck is used the ground person seems to be moving something at the side panel of the truck. Is this a bug?
No, just the same animation is used for the towbarless vehicle.
2) Would it be possible to add wing-walkers ?
Of course it will.
[3) Multi-node pushback would be excellent to have (I have read this is in the works?)
Yes, this should be in the next update.
GSX would be the superior product except for the people who prefer voice control.
Nobody said GSX would *never* had voice control...in fact, this was suggested a while ago but, in order to do that, we should first prepare GSX to be remote controlled, which will be useful for home cockpit builders and airplane developers too, which might want to control GSX without opening any menus.
We have been asked for this by several airplane developers so, works on this has already started.
Once GSX can be remotely controlled, adding voice control become almost trivial.