Scania, now I guess that your english skills might not be on par with the mostly english speaking community here, but I really advise you to flesh out your ideas a little more.
Tell us why you think LfS would benefit from your suggestions.
Your numreous one line (or even just links) long suggestions just seem so spammy. Suggest things for the sake of LfS, and not for the sake of suggesting things and your postcount.
Now to topic: A three wheeled car would be quite interesting to drive IMHO, but right now, I don't think it should be high on the list of priorities. First of all, the 4 wheel driving should be made as perfect as possible, and then we can talk about adding cool and fun, but in the end useless, stuff.