This plugin allows users to select a logo graphic which will be
made available for use in the site template as
$ewiki_config["page_logo"]. Configureable through the internal
image list array.
prev << "aview/piclogocntrl"
next >> "aview/control2"

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.