Plugins extensions are to be used like any other LogDistiller extension.
New plugins are done as Java classes extending net.sf.logdistiller.LogDistillation.Plugin.
To declare the new plugin to LogDistiller, create a new Plugins subclass to implement public List definePlugins() API and write a logdistiller.properties resource file like following:
plugins=[Plugins subclass' name]
Just take a look at one extension to see how simple it is.
TODO: create a Maven Archetype...