It may be too late to change this, but I think the most useful configuration would be to move the decimal point six places to the right. 1,000,000 New Bitcoins equals one old Bitcoin. The most common unit would be the KBTC = 1000 new Bitcoins = .001 old Bitcoins.
It is much easier for people to think and talk about thousands of something versus thousandths of something.
Never going to happen.
Use mBTC (most clients support it).