It should be possible to export file details, comments and other metadata to some kind of xml file in order to be able to backup such information and (re-) use it on other computers.
I think this would increase the number of ratings for files on G2 drastically.
Just to give an example: I had some months ago a library with not less than 200+ rated and partially commented files (comments on quality and content). This has all been lost during a library rescan.
And now just imagine Shareaza would back up (not only export) this data to a file and after a library rescan, known information would be readded to the library... Could you imagine the result? This would multiply the amount of available ratings on G2 by 10 or more...