I have good news and bad news...(kung-fu), I can changue the space button.... but i can changue it to the intro button . XD.
The normally is interprete de subroutine, but... we can try all ff combinations with lucky it work. .... voluntary?
00,01,02,03,04,05,06,07,08,09,0A,0B,0C,0D,0E,0F,10 etc etc... until ff XDDDD. another posibility is found the code to the "p"first so we can change the kick/punch in the pause button.
well we can discard the 28=space and the 15=intro. lol.
Poke 764B with the desired number 28 is default=space and the 15 is intro.
Done!! Victory!!! yepah!!. I discover how works. C1=p button and 4A=joystick button 2. so poke 764b with 4A makes the fix