cooking grains in a rice cooker

I just received my new rice cooker, a 3-cup Zojirushi (the European model: NS-LAQ05) and am extremely happy with it. However, I was wondering whether it would be possible to use it to cook grains as well, such as millet, quinoa, bulgur, barley... But I am not sure about how much water I should use and what programme would be best. This rice cooker has 5 settings: white/mixed rice, sushi, quick, porridge and brown rice. So far I have tried only the white/mixed and brown rice setting.
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