The Donut/Drift Mode already uses handbrake, i guess you use with brake for reverse, which is not made for that. DOnut mode is to make donuts around objects. But will try to see what can i do.
What you mean about "J" turns ? Any example? I can do 180/360 very easy if you mean that. Or what kind of turns?
Rrear view not works right, i need to fix it.
Already know about the steam VR thing, will see if i can fix for next update.