* Braden Shepherdson
One handy use of this that occurred to me (I'm not sure if this is possible under the original system) is to have "namespaces" of sorts. I wanted to add a bunch of "execute this app" (or maybe runOrRaise) key bindings, but a lot of keys were taken when just using mod and mod+shift.
This was possible before, using XMonad.Actions.Submap. As Brent said, he just wrote keybindings parser (i.e. introduced convenient emacs-style syntax). BTW, last night on IRC I saw several emacs users discussing impossibility of redefining keys in vi (I guess that discussion was related to this patch). I had no time to response then, but yes, in Vim (current de-facto standard implementation of vi) user can (re-)define keybindings, including even different bindings for different modes. -- Roman I. Cheplyaka (aka Feuerbach @ IRC)