Richie-
Going by titles doen't eliminate (or even reduce) the classification problem; it just makes for more typing. Consider th Child Ballad "Two Sisters." It carries titles ranging from Binnorie, Edinburgh, Swam Swims Bonnie to The Cruel Miller. Alphbetizing don't do you no good.

Laws has (Susan, correct me if I have the numbers wrong) some half-dozen different entries called "Waterloo" and a few more "Plains of Waterloo." He never specified how to distinguish among them.

BTW, any useful index should include a full-text search, and an extensive list of plot elements.