Kaiser Knuckle kick inputs have wrong mappings (d_taitof3.cpp), that's why he can't bind the buttons. These are the correct ones
{"P1 Button 4", BIT_DIGITAL, DrvJoy4 + 0, "p1 fire 4"},
{"P1 Button 5", BIT_DIGITAL, DrvJoy4 + 1, "p1 fire 5"},
{"P1 Button 6", BIT_DIGITAL, DrvJoy4 + 2, "p1 fire 6"},
{"P2 Button 4", BIT_DIGITAL, DrvJoy3 + 8, "p2 fire 4"},
{"P2 Button 5", BIT_DIGITAL, DrvJoy3 + 9, "p2 fire 5"},
{"P2 Button 6", BIT_DIGITAL, DrvJoy3 + 10, "p2 fire 6"},
Bad Dude,
For Kaiser Knuckle, you'll have to press F5 and map buttons 4 5 and 6 to buttons you wish to use for kicking.
best regards,
- dink