Homebrew Genesis Plus Gx with an original Master System controller

[soniccomcisbr]

Im using an SMS joystick with an adapter on Wii Classic Controller input. The problem is that I need one more button for pause. So I noticed this emulator have shortcurts for that. I holded buttons 1 and 2 of my SMS joystick and I made a 360o. turn on the diretional (zangief's pile drive style) so, the game was paused but at same time its turned the fast foward on. Here the question: where I can find the shortcurts list for genesis plus gx and specially for the Master system pause