No, I'm already taking Uber Black. I'd like to offer them more money in exchange for better service. How do I do that?

Or are you saying all Uber Black drivers are exactly the same quality and provide exactly the same service?

It's called tipping. You go ahead and pay the driver whatever the heck you want for better service, $1M, whatever. Hand cash to the driver if you want.

Great, how do I tell the driver ahead of time that I'm willing to tip more for better service? For instance, how do I communicate to drivers, I know I'm in the middle of nowhere, but you should drive over here and accept my request because I'll tip more heavily?

I mean, it's just a platform for communicating with independent drivers the way that Angie's List lets me communicate with plumbers, right? So there's definitely some box in the app which lets me send this message out, I just need to find it?