
In the active panel in the image above, the active tab color matches the folder path backcolor. But in the inactive panel, the active tab does not match the folder path backcolor, which breaks the rolodex metaphor.
The color option mentioned above would fix this minor visual inconsistency. In the above case, the user would select white for the active tab in the inactive panel to maintain the rolodex effect for the inactive panel as well as the active one.
Not a big deal or anything, but would be nice to have.