osu!ui skinner is basically a more complex version of my osu!BackgroundChanger project. It allows you to extract your osu!ui.dll file into folders containing all the resources in it, and can compile ...
lets say you already have a 1m nm score on the leaderboard, but you want to replace that with a difficulty adjust score with cs7 or something, Overwrite would allow that score to be the one to show up ...