There have been so many requests over the years for various specific personalisations of the category system, allowing user-defined layers and sorting options (such as this thread for Genre>Artist>Album, sorting albums by year, separating the display of multiple-disc albums using disc#, and tons of others) that I still firmly believe the best long-term answer to fulfill all of these requests is not to merely tweak the current options one at a time, or to add new ones to an increasingly con