Hello Umberto,
yes, GSX2 works well with the Saab 340 and my other airplanes, and I have correctly configured those planes (see sharing area). However, the Saab 340 (for instance) is a plane with pilot, copilot, and about 40 passengers. Normally, such a plane would only have one flight attendant (FA), but GSX2 always boards 4 FAs. It would be more realistic if one could configure the number of FAs for every airplane. It just looks odd if you have 4 FAs entering the plane and then maybe 20 passengers.
For other planes (think of the Constellation), the number of cockpit crew might be more than 2, so customizing that number would be helpful, too.
Best regards,
Peter