This is a feature that Pandora has that I really miss in Spotify. This is for those of us who accidentally like or dislike a song or change our minds about a song, so we don't have to start over with a new station. The ability to add a song to the liked category without having to wait for it to play would allow us to add variety and/or help our station get back to the music we actually want to listen to. Also, this would enable us to add a specific version of a song that we like more than others. Lastly, we should be able to see which songs we've liked so we know we don't have to like them again and so they don't show up multiple times on the "liked from radio" playlist.