This little Terminal trick seems to be whizzing around the Internet at the moment, I might as well show it to you if you haven’t already seen it. If you have used iTunes at all you will know that there is a star rating system for songs. Each star is out of 5 and can only be a whole star. With this little hidden preference option, you can now add stars which are equal to a half, enabling you to have a 10 star rating system in effect. Its simple.
To access this setting close iTunes and open Terminal. Inside it copy and paste or type the following.
defaults write com.apple.iTunes allow-half-stars -bool TRUE
Its that simple. When you open iTunes again you will be able to add half ratings. To add such a rating slowly drag from left to right on the rating dots. You will be able to see the half come into effect. If you are very skilled with the mouse you can click in the center of the star or slightly to the left. This half rating system works with pretty much any star rating options in iTunes except on the right click menu.
If you want to turn this option off you can type the following into Terminal.
defaults write com.apple.iTunes allow-half-stars -bool FALSE
Restart iTunes for it to take effect. I haven’t tested this but I think the half stars will remain, you just wont be able to add new half star ratings.