LFS Development is slow no doubt, but you only need to look at what we've been given (for free mind you). They may take their time producing more content, but at least we know when we get it, it's always quality.
As for something new.....
I've heard its a technically impossibility due to the LFS engine. But having a completely open South City would be fantastic.
Series Admins could design a new race course the night before a race/round without the possibility of someone having done alot of practice.