Here is a post I created to gather ideas about a new "Window" group that could be created since our beloved developpers added the Multiple Window feature.
Idea 1. "Window" group
Create a new group called "Window" that would contain other icons such as the following ones :
Idea 2. "New Window" button
In this discussion : http://bexplorer.codeplex.com/discussions/358419
... dwcode asked if it's possible to move the "New Window" button into the View tab.
Idea 3. "Three icons for arranging windows"
Finally next to the "New Window" icon, there could be, as three small icons :