Set F7/F8/F9 to perform iTunes functions like built-in keyboard
CoverSutra, among other things, will let you set your shortcuts the way you want it


  Global Shortcuts
  
  Instantly control iTunes from anywhere, quickly and easily. Play, pause, rate, show, skip, rewind, fast forward... and much more! CoverSutra gives you complete control over your music with fully customizable keyboard shortcuts.




It's main feature (at least for me) is its Music Search. Its like Spotlight for iTunes. Activate it with a keyboard shortcut and search away!