Preferences should offer me a way to define my display name. This name should, with proper markings, be used in git commits, etc. -- RichiH

I.e. care should be taken that I don't simply change it to joeyh@kitenet.net and start writing crap. For example, the display name could be displayed before the OpenID string, by default. Which would be worthwhile change anyway, no matter if you will support display names. -- RichiH