The contents of the CD Rom I am viewing is sorted alpha-numerically regardless of the file type. This happens using the JJOS or an MPC running an Akai OS. If you move the same files to a CF card, than my 2500 w/JJOS sorts the files alphabetically according to file type.
But you guys are getting away from the issue (non-issue for some I suppose).

There is no 'View' param like most other MPCs which is useful for filtering what you want to see in the load menu. No need to beat a dead horse any further. This is just an observation of a user with 15 years experience on various model MPCs.