One thing that would be a really awesome addition would be reading FLAC track art - I don't think I've ever found a player which does this reliably. For example, it confuses the default player into using one piece of track art at random for the whole album!

In QuasarMX, track art is displayed where possible for most filetypes, and album art shows otherwise. When playing FLAC files, though, album art always shows, even where I've checked there's track art for each file. I don't know how feasible changing this would be, I'll admit.