Hm, SDL is part of the application and the license is in the doc folder - which i actually forgot to add in the releases. Thanks for noticing this, i will certainly change it.
I will also offer the sourcecode of the lgpl-libraries on our website (we must do so according to the license). Thought i don't actually know why anyone would be interested in it, as we didn't change a single line in it :-). Well, programming is unfortunatly restricted a lot by all that legal poop this days ... guess we gotta live with it.
As for the keyboard controls, i'm sorry, but we won't find any setting which will be perfect for everyone. We worked a lot on it until it was possible to get the same times in the races with keyboard than with a joypad or a joystick. Part of it was also the latest change, no longer using the normal cursor controls, but setting a two-hand control as default. I don't know - maybe a throttle based control would have advantages, thats hard to tell without playing with 'em a few weeks and comparing the times. So for now we just have to hope you get used to the controls as they are.