A great feature for people with low processors like mine is to be able to transcode the replays into a video format. For some people like me, a 1.6 ghz processor is crappy and can not run osu! and fraps at the same time. A transcoder in the way Final Fantasy Dissidia does it where you save the replay then you can have the option of transcoding it to an avi. It may also be useful so you dont have to leave the osu program to start up another.