The hash portion of a URL is not transmitted to the server by browsers, so it wouldn't help in the case of putting the string into a URL bar or a hyperlink.
If the resource you're linking to is a database (or to speak more strictly, if its only representation is a resource of a noms-database media-type), rather than an HTML page or something, can't the browser can be configured to pass it off to a Noms implementation, complete with the dataset identifier within? I mean, that's what people do with page numbers in PDF files, right?
