So basically, this will be a library that you can use to add keyboard shortcuts, a command-line (minibuffer) interface, and extensions/plugins to your application, and they can all can be reconfigured, mixed, matched, and extended, all on the fly without recompiling or even restarting your app.

Currently most of the apps I use don't have all that and I'm getting along fine, but dang, it would be fun to see what could be done with that kind of power added to them.