This may of been suggested before, but I think that it would be cool if there was an option that allowed you to see your opponents ghost as he/she moves their joints. I think it would add some excitement to the game and it would be really useful to those who are into sparring and it would probably be an effective teaching tool as well. Although I am not sure how hard it would be to implement into the game, but it doesn't seem like it would too hard. On the other hand I feel like it wouldn't be friendly to those with a poor internet connection, but it would be optional, since it would pretty much change the feel of the game completely.

*If ghost refreshing would be too hard on bandwidth, it could just refresh when the ghost resets and shows the motion again.