Shows up a list of pages, that exist, but are not linked from any
other pages. These is often also called dead pages.

Note that this plugin does not take into account, if any page
can be reached from the frontpage - such a hypertext tree test
would require much more work than realized in here.
prev << "page/aboutplugins"
next >> "page/wantedpages"

You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.