As a BAT, I have a lot of maps in my Songs folder that aren't ranked, and a lot of them are bad and abandoned and are basically just taking up space. Since osu! can filter unranked maps, there should be a way to delete all of them except ones you created. Sure, I could go through them all one by one, but that would take quite a while. Plus, I might delete one of my WIPs by accident or something. And it seems pretty easy to implement...?