About minimum quantities (the ¾ cup amount comment really threw me!)
http://www.zojirushi.com/grains/nslac05.html

Interesting how the manufacturer suggests you can make a minimum of ½ a cup when making shorter brown or white rice but that you need a minimum of 1 cup for jasmine rice.

Personally, whilst I might use less than a cup if I were to make brown rice as it needs more water than white (something I don't do as I prefer to use a pressure cooker for brown rice and the arsenic levels for non-California grown japonica brown rice are a bit worrying when cooking for a small child. I do often add a tablespoon of other grains - particularly millet - to white rice in the zojirushi instead) I never use less than a cup of white japonica rice.
That translated talk I had with the Toshiba lady was REALLY informative.