Does anyone know how to remove entries from the Import settings, Aperture Library, Store Files list in 3.5.4?

For me, the list contains invalid locations that have similar names to my current referenced folders, and occasionally, I choose the wrong (non-existent) location, which Aperture deals with by importing the images as managed instead of referenced (no warning is provided).

Aperture doesn’t appear to provide any way to edit the list.  I’ve tried editing the RecentReferencedFolders and RecentReferencedFolderIndex in com.apple.Aperture.plist, but when Aperture is opened, the entries are still there and the entries reappear in the plist file.

Any help is appreciated.  Happy New Year.

Aaron