Supporting user profile gathering out of the box?
This is maybe not in the scope of grant, but it would be nice to have means to easily obtain user profile data. 

As the example shows https://github.com/simov/grant/blob/master/examples/user-profile/app.js, you have to have prior knowledge of the endpoints needed to get user data for every supported provider. 

To build a system that relies on external providers for authentication, you have to go through docs, do some coding and then testing. I think built-in support of it would make grant be more outstanding, even beating passport.js...