I have to say I agree with you on the roundabout. Nothing changes a driver's mind like a square curb. That particular intersection didn't have space though, so they installed that abomination.
Changing driver behaviour though? I'm pretty negative about it.
I get honked at regularly for stopping at those stop signs. The police head to Twitter and make fun of a few drivers a week for stunt driving. The city is opening a new processing centre because they can't handle the load of the speeding tickets from the speed cameras.
Yet I only see more and more aggression out there. People drive like they're the only ones on the road.
It's a 40 minute walk, one way, from my door to the nearest store. As much as I'd love to avoid the situation altogether, I don't have time to walk. Forcing people to drive everywhere is probably part of the problem, though.
Can't fix crap drivers, no matter how hard we try.