Sort by play/skip count ratio?

I mean, since Play Count and Skip Count are stored for each song, might as well use that info, right? So, how about being able to sort a playlist by the Play/Skip count ratio? If the Skip Count is 0, make it 1 in the ratio calculation.

Also, is there a way to embed Play Count and Skip Count (and rating while we're at it) within the music file itself as non-standard metadata? I'd like my music library to be as portable as possible, keeping data consistent from a device to another.