The ability to use a different Audio Track, put together with the Video Track from a different source (eg. Video from one clip but using the Audio from another file).
This way, people can put together [as a couple of examples]; a Tutorial that shows how to do something, but use a different Audio source (a sound file of them talking, a song, etc), or a Montage (array of video clips) but then use a different Audio source (music, etc) over the entire video.
Perhaps this may complicate Bandicut too much and/or it is outside the scope of the concept of Bandicut (to keep the utility small and easy-to-use) - it is merely a Suggestion - I am enjoying Bandicut otherwise!
