First off: Amarok 1.4.5 running on Gnome 2.18 but with KDE 3.5.6 installed (Ubuntu 7.04 beta)

I've switched from windows, and using the media player I used to use (J River Media Center) I have got all my music filenames like this:
Artist - Album - Track Number - Title - (Rating).mp3
I know you can 'guess' most of the info from the filename using right click > edit track information, but not for ratings. Is there a way to do this?

If it helps, I can easily change the filename format to pretty much anything.

Thanks in advance