Do hosts have to be home in person or are you guys partnering with smart garage door opener companies? I can't see letting people use my garage at night since space is a premium and I need to charge my own car.
At this point if the charger is in an access restricted place, the host will need to somehow allow access. In California, there are many that have the charger installed outdoor and use the garage as another room or a gym. In the Bay Area, for instance, 36% of people who share their charger have it installed outdoor. For chargers installed outdoor, it's fully automated. Working with remote controlled garage opener and some security camera partners are definitely in our plans. We are also looking into the option of extending the charging cable, so it can be left outside.
Many chargers have wifi or bluetooth connectivity. Seems to me that there's an obvious integration here. Visitor's phone and charger authenticate each other, charging starts.
OpenEVSE could be a perfect platform for prototyping this. Our hackerspace has one on the wall right now, and we're adding another because so many members drive EVs now.