Nickname/Username use not consistent
There are a couple of places on the orbiter that don't use the Nickname consistently. the area in the lower right-hand corner of both UI1 and UI2 display the Username of the currently signed in user. It should show the Nickname if available, and only fall back to the username if a nickname is not present. The same problem exists on the user status icons (Away, Sleeping, etc.). If you look at the screen used to select a user, however, you will see that it is implemented properly by using the Nickname if it is available.