More Buttons

[Neox666x]

Hi

Is it possible to set more buttons on i2c? or GPIO?
i´m not using the gpio joystick ports but if i map 1,0x26,0x27 it want´s joystick 0 for first joystick on all emu´s.
i need a button for coins,esc., 1 Player and 2Player Start.......

or can i use the other gpio´s free to set keyboard key´s to buttons?

in the past i have used one joystick on gpio mapped with retrogame.c
Thx for help