+1
Duplicate finding is a nightmare when all it finds are 100% matches for a given tag - commas, ampersands, quotes, typos all break it.
Some features like "Tag is n% match" "Ignore X/Y character(s)" or "First N chars match" would solve most of the issues I have with it.
Edit: also a "if there are >N duplicates in a folder, include that entire folder" option.