Spinning Cube Mania

Have you ever used Image Capture under Mac OsX 10.3 Panther?
If you do, you’ll notice that the so famous spinning cube used during the fast user switching has been used for not-so-glorious applications too.
And, speaking about fast user switching, why do the user switching menu need to be a menu-extra on the right side of the menu bar?
Menu bar space is a terrible thing to waste.
Since under OsX anything related to the login is in the Apple Menu (Logout User, I’m pointing at you), can’t we have the user switching list over there, or this interferes with some mysterious UI rules?