[nym]

You don't have to rate the driver anymore I believe. Even if you put the step of tipping after getting out of the cab, it's a step.

Having a preset option is a good way to take out the friction, but instead you could just not include tipping and pay higher wages. Tipping is a way for businesses to bury the actual cost of a service.

I understand as a driver, it's nice to get tips, but if you get paid a fair wage it shouldn't matter.