I've had no issues spawning it, the only issue I can see is just that the car shakes and deforms slightly under heavy braking and it doesn't have a proper horn but that's it
All of the features that you want to suggest can already be done, paint.net can be used to paint your vehicle whatever you want, you can edit a vehicle's .truck, .car file, etc. to tune a vehicle how you want and if you can you're able to change the UI yourself
You can also add on whatever...
I've got a really fun section for rock crawlers and for rallycross we can use the paved roads since the rest of them are too extreme for those cars. I've got four great rock crawlers: the trinity buggy, desperado, showtime, and the firebug crawler, people could just choose whichever one they...
The closest you'll get is the Di Tracer from derbymutt's content dump, there is also an oval track in it as well.
https://forum.rigsofrods.org/threads/derbymutts-content-dump.14/
I'm not sure if this is already known but the komatsu D39EX and SK820 are extremely loud even after moving a good distance away from them, just like the original dodge viper.