From EAC version 1.0 beta 2 on, you can use the following placeholders in the filename settings on how filenames for tracks are being created by EAC:
%title% - Track title
%artist% - Track artist
%composer% - Track composer
%tracknr1% - Track number (at least 1 digit)
%tracknr2% - Track number (at least 2 digits)
%tracknr3% - Track number (at least 3 digits)
%lengthmin% - Track duration (minutes part)
%lengthsec% - Track duration (seconds part)
%year% - Release year
%albumtitle% - CD title
%albumartist% - CD artist
%albumcomposer% - CD composer
%albuminterpret% - CD performer
%comment% - CD comment
%totalcds% - Number of CDs in a set
%cdnumber% - Number of the CD within a set
%numtracks% - Total number of tracks on the CD
%genre% - ID3 music type
%cddbid% - freedb ID
%cddbtype% - freedb music type
%% - The ‘%’ character
As an example, you could use
(%tracknr2%) %title% - %artist%
which would result in such a filename (as an example)
(02) Nothing else matters - Metallica
