Hi,
i''ve build a small Maven plugin to build Openfire Plugins. Its a mix of the maven-war-plugin and the Jetty JSPC plugin. Usage is quite simple, just add the plugin to your POM and set packaging to "openfire-plugin".
Currently the plugin is available from SVN at
http://svn.reucon.net/repos/maven/plugins/maven-openfire-plugin/trunk
The site is available at
http://maven.reucon.com/projects/public/maven-openfire-plugin/1.0.0-SNAPSHOT/
=Stefan