God, I always love modding games. I tried my hands at modding once, and realize it takes a lot to figure out all the file structures, memory addresses, costume ids/moveset ids etc etc. I respect all who make such an awesome feat possible.
I saw some of these mods on IGN, they replaced Chun li with Balrog, watching Balrog do spinning bird kick was hilarious, and it was weird when he did the super and floated down.