I've been looking for this one for a bit tonight, and it doesn't seem to exist in the form I'm thinking of, though some things are similar. Imagine it like this: Player crafts an emerald block, puts it down. They can then right-click on it, and a command runs that's set for "emerald block" in the config, as user, superuser, or console (much as per Craftbook Command-Items, or the global version of PowerTool - and many of those options would be useful, too - but for placed blocks, and globally). That.
