In 32 years of working at a fairly busy airport with plenty of biz jets. I can't say that I've ever seen any bizjet get pushed back. That's another way to look at it.
The FBO/Ground handler positions the aircraft prior to the crews arrival so that it can just taxi off of the apron when the time comes.
It took me only a year of being a ground handler at a much less busy airport to witness a pushback of a bizjet at a small FBO with pax onboard. It does happen. It's rare, in this case, the turnaround was so quick they didn't have time to reposition it, and the ramp was too busy to have "through" parking set up.
I would first pick a spot that looks like it is at an FBO/GA apron, and then adjust it in GSX to suit your needs. Most GA/Bizjet parking in any of the sim's is taxi in/taxi out.
This is a good suggestion and when paired with GSX's ability to "teleport" to parking spots on load means you don't have to mess with the AFCAD, just update the parking configuration at your favorite airport to support through parking.
That said, I would like the feature available, so to that end:
I have found a temporary solution to this glitch. After asking for pushback and choose the direction, start editing the plane. This is going to make the plane levitate a few centimeters. To realese parking brakes and start engines, change the camera to the cockpit one. Finally, when the pushback ends, change the camera again back to the "showaround" one and press enter to leave editing mode (I don't know how this camera is called in the english version).
Hopefully this workaround can give Virtuali some idea of how a programmatic work around can be added?
Finally, it'd be really nice if we could define parking spots as power out spots. When I was a ground handler for Northwest at a smaller airport, one of our gates we didn't do pushback, we just moved the jetway far enough out of the way that the plane could literally just taxi out. It'd be really cool to be able to instead of setting pushback we can set taxi out path and have a marshaller guide the plane along that path.