I like it. Even if it doesn't make it into VA X, this would be a useful extension by itself. I could see it working both before and after clicking on stuff: you could have selection filters that are set prior to clicking on things, or add something to the context menu to expand the selection to one of these scopes.
While you're at it, might as well add namespace, containing namespace, containing class, lambda body, c-style comment block, and "chunk of text up to all whitespace or blank lines".