As of current, crates can only be sorted on One level (i.e.: Number, Song Name, Artist, BPM, Year, etc.).

Depending on the level of your crates, this can be rather intuitive, but I'd like to see it go a bit deeper.

As an example, in a relational database (or even in spreadsheet programs such as Microsoft Excel and Google Docs), you can sort on one Column, and then Sort on another (and another from there). What I'm looking for is something similar from Serato DJ's crate management system.

In example, without needing to create multiple subcrates, I would be able to sort by Year, then sort by BPM. This way, songs in years 2014 might show before (or after) 2013 (depending on Ascending or Descending order), and then order by BPMs in Ascending or Descending order thereafter.

As another example, one could sort by Year and then by Date Added. That way, one would see songs in a particular year first, then the date they were added to the DB second.

I feel this would provide added levels of customization to the crate structure of each user, and provide users with a more verbose method of organizing their data (while possibly becoming less reliant on subcrates and/or multiple directories).