Have a look in this category:
http://www.wowinterface.com/downloads/cat19.html
There are several addons now that either replace those with more buttons or just remove that part of the bar entirely.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh