I believe you can use Beat Snap Divisor when you are creating certain sliders. Also you can use it if you want to map certain parts of a song. Like a stream part, you can use 1/4. If there is something faster than a stream that requires 1/8, you can use a reverse slider to match up that point. When you change the beat snap divisor, you can map more things than usual, just make sure that its not to insane
This is the most facts I can give because I'm pretty dumb.
Hope this helps!
Azzy~