I see. My usage pattern is "one screen per purpose" and does not involve docks. I guess I'm using screens like tabs. It is natural to me because I have always used virtual window managers on Unix workstations and later Windows PCs. (Anyone who wants free virtual desktops without computational or memory overhead should check out
Johan Piculell's VirtuaWin.)
WAD is an amazingly flexible piece of software which supports the many different ways in which people want to use it.