Can the parameters of the Music Lens be edited?
Solution 1:
Currently these can not be edited, your best bet is to file a feature request with the maintainer.
https://launchpad.net/unity-music-lens
Keep in mind that a lense has to be fed by scopes, so not only does the lense need to be updated but whatever scope is feeding it will need some love too. (default is rhythmbox - I think, I use clementine)