With the osu!mania mode being officially a ranked mode and some players experiencing simultaneous key input issues, why not have this feature on Options as well?
This is so that players don't have to go through hassle of looking around for some external program while trying to find out which keys works when they wanted to bind new keys.
This is so that players don't have to go through hassle of looking around for some external program while trying to find out which keys works when they wanted to bind new keys.