iChan said:
no, it doesn't work, it only replaces it...
i wante to get rid of that item completely.
The only way I found was to edit the preferences file as follows:
Go to Home/Library/Preferences/ByHost/ and open com.apple.screensaver.000a95851bf2.plist in a text editor or Property List Editor if you have it installed (the numbers and letters at the end of the name might be different, I'm not sure).
If you have Property List Editor, find lastPictureDirectoryChosen in the property list and delete it. If you're using a text editor, search for com.apple.screensaver.000a95851bf2.plist and do a search for 'lastPictureDirectoryChosen'. Then select and delete '<key>lastPictureDirectoryChosen</key>
<string>[***Path of selected folder***]</string>'
Be careful that the first character you select is the '<' and the last is a tab (the last character before the next <key>). Save and it should be gone from the list.