If the real cars didn't have power/coast adjustment then it's very unlikely to be brought back to this class in R3E. About the physics, I think it's all a matter of preference. DTM `92 was my favourite class before the December patch, and they still are now. Despite feeling decidedly different, to me they still have the same kind of character.
I mean, if you watched these beasts race for real, the last thing you saw was stability. They were generally all over the place, sliding through corners, jumping curbs, running on two wheels, etc. It's what made this class so much fun to watch (along with the other true touring cars of the period), and I think R3E does a really good job of capturing that feeling.
I'm someone who generally prefers stable cars when racing competitively, but these are the exception because they're so much fun to throw around. They're also one of the few classes I bother to drive on my own outside of club racing, because they're far more fun than hotlapping in a stable GTR 3, for example.
But that's just me. We all have our own preferences and ideas of what's fun. We also have a
dedicated thread for discussion on DTM `92 physics.