As you probably know it is possible to open and close the first half of the front doors (the one closest to the windscreen) with a mouse click.
As stated in the manual:
4.6.11. Shutting Down the Bus
1. Set the parking brake (3) and put the bus in neutral (9).
2. Turn off all the fans (43, 45) and the auxiliary heater (37) and
make sure that the passenger lighting (39), engine cooling
system (47) and windshield wipers (42) are off and the driver
and passenger windows are closed.
3. If you’d like to exit the bus, set the bus stop brake (10) and
open the front doors (11). You can then release the bus stop
4. Turn off the lights and take the key out (4). You can now exit
the bus. You can close the front doors by clicking on the right
maintenance opening next to the front door.
There is also an option in the graphics menu to make the driver dissapear from the bus.
If both functions would be combined it would realy look like the bus driver has shut down the bus and left home.