Thanks for making awesome software!
A way to group tags would definitely be cool.
Right now I am using the user fields to hep myself tag sound in my field recording library. So I have on field called "materials" (e.g. plastic, metal) one called "object" (e.g. car, footstep) and so on.
Bu I would really like AudioFinder to suggest tags that I've used before. So if I wrote "pla" AudioFinder suggested "plastic," and so on.