I disagree, this whole thread is about this being an issue
You are saying it's an "issue" but, an issue in my view is a failure to perform to specification. Here, GSX is behaving to specs, because it has been explicitly programmed only to FUEL the airplane, not DEFUEL it.
Not so sure about that...
People run into this issue repeatedly, yet you say this is not an issue and hasn't been for 10 years?
I'm not sure what you were trying to point out here, those threads I linked just proved by point, both because there are so FEW of them, considering how much time GSX has been around, but even considering what it's being said there, which is the normal way GSX works. It just Re-Fuels, it doesn't De-fuels.
Please do so. It happens IRL, there is no reason not to support this in the sim. In most cases users have no influence (apart from editing config files) on how much fuel is loaded initially. It's just pure luck that the A310 is one of the first airliners in MSFS to be running into this issue on most flights.
Now you finally getting there, and agreed it's not an issue and it's normal for GSX to work like this ( because we made it this way ), we might use the proper approach in requesting for new features.