This is a feature request. As I was customizing views, I noticed that the comments module always asks for the user's name and email address. If the user is logged in, it would be nice to give them the option (or defaulting) to using their on-site account instead.
Happy to build this once I get a little free time. :)
If you're happy to build it! We'd need to allow for configuration to specify how to find the user and this ties into Issue #286