Replace playlist when started by file association, not queue to it?

Normally when I double click on a mp3 file in Finder I would like it to play immediately. Unfortunately, Cog just queues it to the end of its playlist, so every time I have to manually switch to the new file. I was wondering if there's a way to change that? The perfect behavior would be to replace the playlist with the new file(s) when they are opened by file association, but queue them when they are dropped on Cog's window or its dock icon. I think that's how most of the other music players work, including iTunes and foobar2k.