I created an issue in graphql repo: https://github.com/facebook/graphql/issues/163

If you have opinion on this topic, I would encourage you to share it there, it would help a lot.

As far as I can tell, using a naming convention is the way to go at the moment. I some cases, like with mutations, you can model problem a bit differently with field arguments, but I guess highly depends on the use-case at hand.