Adding 2 times the same song to a playlist?
It's actually possible to add the same song multiple times to the same playlist. I'm not sure whether it should be changed or not...
1/ a playlist is well, a list to play, so if I want to play to times the same song, I should be able to do it 2/ it might be annoying if one adds a song a second time because he forgot that it was already in...
I would rather go for the 2nd one, thus disabling the possibility of adding a song multiple times...