I did some laps around Hirochi Raceway immediately after closing Assetto Corsa. I did notice Beamng's tire physics are a little "sloppier" if you will. For example, cars tend to rotate into corners a bit more than they should (prehaps as a result of tire sidewall flex). This feeling can also be a result of differences in the two games' FFB systems, as BeamNG's FFB is a lot more smoothed out (although massively less detailed) than AC's force feedback.
I believe the stock emergency vehicles need a far better emergency light system. as it is now the lights are so dim they are barely noticeable and have a very, very basic back and forth pattern. i believe it would be easier to fix this now than it would be later when cars and maps might have obstacles that prevent the improvement entirely. i also believe we need a fire engine already to complete the emergency trio.