Lists the word parts of all wiki pages, but requires the
powersearch plugin to be present, because the result is redirected
to there as usually many of the listed words belong to multiple
page names.
prev << "page/pageindex"
next >> "page/imagegallery"

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.