Not possible at this time. Hopefully FiiO makes it possible in the future, but for now i suggest making m3u(8) playlists yourself (it's what I do).
I will send an example soon.(see below) If you're on windows, you'll have to reverse the slashes between directories, and add a Byte Order Mark to the file.
Kate for windows can do that. Code:
Code:
#EXTM3U #EXTINF:622, A Winged Victory For The Sullen - Atomos I A Winged Victory For The Sullen/2014 - Atomos/A Winged Victory For The Sullen - 2014 - Atomos - 101 - Atomos I.flac #EXTINF:258, A Winged Victory For The Sullen - Atomos II A Winged Victory For The Sullen/2014 - Atomos/A Winged Victory For The Sullen - 2014 - Atomos - 102 - Atomos II.flac
I have all my music on the µSD card, on root the artist directories, within each directory the album directories, and in those directories the tracks.
The above was generated using Puddletag (on GNU/Linux). MP3tag on windows will have the '/' the other way around for each directory.
I doubt anyone would play their music in alphabetical order per trackname.