Instead of waiting to give feedback about the ride after it's completed, you can write about all the inappropriate, but not life-threatening behavior your driver is engaged in.

One driver, Sergio, thinks it's a way for riders to get a partial refund on rides, at the expense of the driver's reputation and livelihood. .

Harry Campbell, of The Ridesharing Guy blog, said in an email, "I think this one has the potential for massive abuse." He's worried riders will quickly learn that a quick complaint about the driver translates into a ride credit or refund. 

"I think it's important for riders to be able to provide feedback on their drivers but it should happen after the ride and Uber needs to do a much better job at educating drivers on how this feedback is used," he continued.