What he said about the spinners ^
As far as the buttons, you can configure them to basically anything you want. One time I set up 5 target macros for a fight we were doing in raid one night.
They're able to be customized anyway, the two supplied variables just make it so you can cast spells on other players/yourself without typing their name
And as far as the buttons being moved to a place other than above the health bars, this is something that may be looked into in the future. Possibly a window where the buttons are off to the side ,or something like that.