Just a little idea, and not incredibly important: It would be pretty cool if you made it so Osu could open .osz files from the windows interface. Like, I download a beatmap, and just have to open it up like any other file, and it would automatically throw it into Osu, load it up, bring you to the song selection screen with the song highlighted, and delete the osz file. Also, opening it when you already have osu running would do all that but without opening a new window.