This is a good change but the reason I haven't put something like this in yet is because I want us to be consistent everywhere with group name vs. display name.

Before this goes in, I'd like to see display names show up in the tab completion lists for review requests, and allow it to be tab-completed if people type the name.

The other concern is that the display name is often used as a summary, so we're going to wind up with a lot of people suddenly seeing very long names appear in their sidebar.