As an American, I don't find a Bill of Rights to be all that useful. You have nuts on one side of the argument who overinterpret codified rights to apply to whatever insane or dangerous scheme they want to enact in their own house. Then you have nuts on the other side who interpret too strictly, and take the absence of a codified right to indicate that the right doesn't exist. The absence of such a item in Australian law isn't an omission, so much as it is a recognition that law must adapt to the age in which it is applied. I don't know that protection against quartering of soldiers makes a lot of sense in an era where soldiers need more privacy and security than you might get in the average home.