As an alternative to editing files on the player, Emacs will quite happily use FTP to edit the files from another machine. You might want to use a terminal session to remount the drives read-write; I guess you can do that from Emacs, but I haven't investigated in detail.

Religious disclaimer: If you're one of the pitiful fools who don't use Emacs, just pretend I didn't write this.
Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)