I've begun work on a suggestion for Australia in a future BT update (13.0 or further on). I'm in the process of making a rough map, derived from the vanilla map, but with features such as a North-South crossing across the center along the route of the Stuart Highway, provinces around the entire coast and more colonizable areas inland. There will be 3-4 Colonial Nations, a few river estuaries and a 2-3 natural harbors/coastal centers of trade per colonial region.