Rev limiter could be implemented right? Also, do everyone still remember this guy? http://www.beamng.com/threads/2823-General-Sound-Ideas-And-Suggestions?highlight=audio+ideas His sounds were very realistic too. Maybe we could help with this guy.
Yessir, I'm 99% sure the developers are working on it or it will be a future feature. There are a lot of people asking the same you are, sound related at least. Let's hope we can see something soon officially.