This, is in fact a pretty simple request. I don't know if it would earn players extra points or anything, but.. It's basically a modifier that plays the song and beatmap backwards instead, and you have to complete the song in reverse as a result. Could be a cool modifier to fool around with, even if it doesn't award points. I'm sure quite a lot of people out there would fool around with it and use it once in a while. 
I don't know if such a modifier would be worthy of having point value, though. Perhaps it can be discussed?
I don't know if such a modifier would be worthy of having point value, though. Perhaps it can be discussed?