i can currently do the same thing with Junk Jack more the less. But since i don't know a way how to crack a fat binary app like junk jack it is a little bit more complicated. Then on the other side i somehow managed to find out the MobileSubstrate headers, which means i can add buttons into the game, i can even change the speed of Jack etc.
But to actually change code like i did in minecraft i either have to decrypt the app and change the code and to make it legal i would have to make an account for ASLR security in the app AND use MobileSubstrate.
(That doesn't mean i'm not trying

i actually already did do quite a few cool stuff :3 )