Step 6: Enabling Half Stars On the Mac
Then, you have to open up Terminal
(Located at /Applications/Utilities....somewhere in there)
and once it's open, type in
defaults write com.apple.iTunes allow-half-stars -bool TRUE
Hit enter, and then close out of the terminal.
Then, open Itunes
Simply click and drag in between the regular stars to access these new stars.
Congratulations....you should have half stars!