I have just released an extended version named Digi:Arka->Pad with the following features:

• Support for Standard Paddles
• Selectable operating modes:
  
  • Automatic
  • MSX Standard
  • Arkanoid

Also added support for other Arduino boards (spinoff versions)

• Nano

• UNO

Mode programming is performed by holding the button pressed at power up and stored in internal EEPROM.

Selected mode depends upon the position of the potentiometer.