I'm here to present to share my Kindle Music Shuffler with you guys. Please note that nearly all of the code is based off of the Screensaver Hack Randomization algorithm.
To install it, create a folder in /mnt/us called musicshuffle. Place the "shuffle" and "sort" executables (located in the attached archive) in that folder. Now, to use it, just add an entry to launchpad to run the shuffle script:
M S = !/mnt/us/musicshuffle/shuffle
Then, next time you want to shuffle your music, simply run that command, and it will shuffle all of your music.
Let me know if you encounter problems with this, I will try to weed them out, although I'm pretty bad at shell scripting.