Love it. And yeah! That’s very much our vision. We have had an OAuth API out in beta for over a year you should check out: http://docs.patreon.com
Major improvements are on the way, including ways for creators who are not technical to enjoy the very use case you outlined. Stay tuned!
It seems from talking to other UberPOOL riders in SF, this is not fully rolled out to all riders here, which is super interesting. It appears from news releases that in Manhattan it is standard.