When playing music in Amarok, it assigns scores to each track. I've looked up the documentation and the faqs but the way it works is not explained. Does anyone round here know ?

You are right there is no obvious documentation out there. From personal experience it seems to be related to the number of times you listen to a song and what percentage of the song you listen to. For example if you listen to a song once all the way through it gets a score of 74. If you listen to it twice the score goes up to 87.

If you listen to only a few seconds of a song it gets a lower score I just listened to the first few seconds of a song and it got 30.

I'm not sure the reasoning for those numbers tho. Hopefully someone else can answer that.

I think you are right. It can be edited manually though but it's a bit stupid : if you leave the player on random for background music, then you have random scoring.

I guess I'll be emailing the developpers about their plans on that.

yeah there should be a way to turn off the way it scores the songs when you have a random playlist.

It seems to me like a very smart and useful feature.
I disagree with your improvement of not scoring while having random playlist. I would rather disable scoring while PC is unattended - that means user will not change song, because PC is out of his reach. This could be easily implemented the same way instant messengers set away status after certain inactivity period.