Like this you could synchronize your rating, from different PC.
For the moment there is no way to synchronize my rating between to different Amarok2 database even if they have the same songs.

I have find by chance a script on music brainz website... http://wiki.musicbrainz.org/User:Bogdan ... sSubmitter
I was just wondering if someone could help in writing an Amarok script using QtScript.

I did not find how to obtain a a musicbrainz ID of the file from amarok QtScrip binding.

And if there is a way to call the script from the Amarok console without closing and opening amarok.