The title probably sounds pretty confusing but i think that it would be pretty useful if there were a way to alter the opponents ghost so you could hypothetically predict their moves and see if what you are doing is actually countering it. I don't think it would require all that much new coding.

I think you could allocate a specific key to enable/disable and "altering" mode where you could change your opponents ghost in the mode and disabling it would show you the ghost that would happen if your opponent changed nothing.