It is possible to make all the battles in classic mode aside from the last battle 1 on 1s with normal settings in case you were wondering.
You can edit classic mode files to change a lot of stuff using common2.pac and Tabuu, such as the stage selection(you can even include expansion stages).
Not all of the params of the files are known, soooo here's what we got so far:
http://www.smashboards.com/showthread.php?t=288062Classic mode files are on the second post of the op. The first part explains the color coding system and focuses on Event Matches.