Transforms a pages content using letter transformation to make
them readibly from upside down with certain fonts. This however
is a bit tricky for html pages and thus will always wrongly
intermix sentence order.
prev << "filter/fun_chef"
next >> "filter/fun_wella"

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.