I've been driving a lot the last few years all over North America (US/Alaska and Canada). One of the hazards that absolutely destroys me are unmarked frost heaves (severe road bumps). There are hundreds of miles in Northern Canada and Alaska that have me at the edge of my seat and inevitably bottom out my suspension. I can't really mark these numerous hazards while navigating them. I think it would be great if the app had some opt in feature that reads my phones accelerometer and reports large bumps while driving (maybe even cross-validation with other users).

Or add this to the drivers real-time reporting function, so drivers crowdsource the road quality (rotten tomatoes like), then use those ratings in offering up routes to avoid like avoiding toll toads / unlaced roads.

I think it's a good idea, even more if you see it from API perspective, that way you could make available heatmaps of asphalt status to cities and companies to act on.

Not a good idea as it will drain battery faster than it is possible to charge it. Also you should avoid potholes not drive trough them

See also http://waze.uservoice.com/forums/59225-map-editor-and-waze-com-website/suggestions/2535320-use-g-sensor-for-detecting-speed-bumps-and-quality and join the votes