This has been around forever, but someone asked about this yesterday, thought it was worth a mention.
To enable half-star ratings in iTunes on your Mac (there’s a Windows equivalent, too), do this:
- If it’s running, quit iTunes
- Launch Terminal (It’s in Applications > Utilities)
- Type this command in Terminal:
defaults write com.apple.iTunes allow-half-stars -bool TRUE
To turn half star ratings back off, type:
defaults write com.apple.iTunes allow-half-stars -bool FALSE