It would be nice if we could change world order, i.e. making window 3 to window 1. I'm not sure if you know what i mean.
For example:
World 1 - Mud1
World 2 - Mud2
You could dragdrop or something and make Mud2 Window 1.
You can change the initial order in the Global Prefs screen, so if that is what you want, it will open them in the desired order.
However to change it dynamically means getting at the internal data structures used by MFC (Microsoft Foundation Class) library, which I am reluctant to do. The whole point of using a rapid-development system is it saves you work, however if you then try to work "outside the square" and do things it isn't designed to do, you are likely to spend hours and hours, and end up with bugs.
I have an old saying which is relevant to this ... "why buy a dog and bark yourself?".
In this case the dog is MFC, if you'll pardon the expression, and I don't wish to start barking.