One queston to dev's: I wonder if you could implement that every driver chooses his own car sound, so not all cars sound the same? E.g. in a same race two XRT's sound different. Sounds nice. The sound could be downloadable like skins.

No

This can already be done, during the race, Shift+a, and tab between the cars, and you can select a sound for each different car, it takes a while to do, and with users entering and leaving the server, its hard to keep a good mix going.

But! i did manage to get a nice 10 lap race surrounded by XFG's, that all sounded different, it was an experiance

Default sounds of LFS are terrible, try CarSoundRemixer in this post http://www.lfsforum.net/showthread.php?t=12863

Car Sound remixer is terrible, stick with normal LFS sounds, and be quicker.