Have you tried XMonad? Functionality and stability are great, the
source code is clean and small, and you can configure and extend it in a
powerful language (Haskell).
For this particular application, I'm not sure anyone could do as good a
job in Racket as they've done in Haskell, but someone should try.
Incidentally, my nascent Racket-based appliance currently uses XMonad to
pretend that there is no window manager
("http://www.neilvandyke.org/weblog/2012/10/#2012-10-24";).
Neil V.
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