@rwzy: Not that I'm aware of. though there are some similar behavior, like ratpoison, which behave like GNU/screen (or emacs). You have to press an escape sequence before the actual keybind.

There was also an obscure WM coded in Lisp, that has a really weird behavior, where you created containers, windows, and nested containers, and such... Can't recall the name though. But you probably don't wanna try it, trust me :P

@venam: Yeah, he did an amazing work here, either for commenting, or writing nicely readable code.