In the popular question What Custom Launchers and Unity Quicklists are available? are listed a lot of launchers with custom quicklists for Unity, that worked for Ubuntu old release, included 12.04.
This is a sample from the first answer:
X-Ayatana-Desktop-Shortcuts=Videos;Documents [Videos Shortcut Group] Name=Videos Exec=nautilus Videos TargetEnvironment=Unity [Documents Shortcut Group] Name=Documents Exec=nautilus Documents TargetEnvironment=Unity
Why that quicklists are missing after upgrading to Ubuntu 12.10? This code is no more supported?