One thing that Carsten just pointed out to another person is that if there is no centre position of a lever, then centre and lower position are set the same. And only combined drive-and-brake levers have a centre position. This boils down to calibrating all levers with centre (middle) position equalling low position.
Regarding sound, I know that they had loads of problems. They started out to implement full 3D sound or at least half of that but found that the full version is very, very hard to do, and resource-hungry, too. So they decided to release Zusi 3 with what they have instead of delaying it for another year. I love that decision because I play with muted sound all the time. But many people complain about various details, and everyone about another detail, illustrating the complexity of the domain.
Regarding graphics settings, I am not sure what you are aiming at. Basically you got these 2D cabs only in given resolutions. Sticking with that means the cab graphics don't get distorted or otherwise ugly. If you don't show the cab graphics, then you are free to choose any resolution you like. I grasped that they implemented loads of them, so the native one of your display should be there, for full screen mode in optimal quality.
Regarding the game's rendering settings controlling the distant fog and tweaking the LODs and such, I suggest taking it easy. I had some wild play with these controls, e.g., showing the next better mipmap, which resulted in aliasing and Moiré effects. Also, when I turned off the distant fog completely, I watched trees on the horizon file in one after the other as they met the draw distance, so it was more funny than realistic.
There again, Zusi takes a challenging, unconventional position. Normal games let the asset developer or the scene (route) developer control the appearance of the scene. Zusi gives the user much more power but how far you get still depends on how the scene is set up. If there is no distant scenery, then a huge draw distance gets you nowhere.
Regarding the translation, concise pointers to interesting parts are welcome. Being the earliest adopter, you make 100% of the current sample, but sample size is a bit disappointing for serious statistics.
