Bear with me here, but I am remembering some strange thing where knuckles glides, but if you were playing two player sonic or whoever could ride on his back whilst he is doing so. I have no evidence to back this up other than a faint memory which is something im fairly sure that I dreamt up, but I thought I would ask you knowlageable lot first. I can even remember a picture of and ingame shot with sonic riding on knuckles back.
If im right then way hey, if not then wouldn't that be a great thing that you could do.