Starting 2.1, you can now add Custom Defined Rulesets with PMD plugin. Previously, if you want to use your own rulesets with the PMD plugin, you had to unjar the pmd.jar file & add your ruleset defination in the jar file & re-jar it & use it. But this procedure had to be repeated whenever a new PMD is out. But not anymore. Now you can simply point PMD plugin to your custom rulesets.xml file & drop your custom ruleset jars in either of jEdit jars directory(either system or user). Once this is done, you will be able to manipulate your Custom Rulesets just the way like the built-in ones.