The OMNeT++ plug-ins define some extension points that can be used to change or extend the current functionality of the IDE.
From org.omnetpp.common:
org.omnetpp.common.wizard.contenttemplates : You can add additional content templates to the New File wizards.
You must specify the location of the template files in your project (by default it is templates).
org.omnetpp.common.wizard.templatecontributors : You can add template variables to all of
your templates. The plug-in must implement the org.omnetpp.common.wizard.IContentTemplateContributor interface
to contribute to the template variables.
New wizards can be added to IDE by implementing them directly in Java. For complicated wizards, this is the recommended strategy. If your wizard just gathers some data from the user and then generates some file as the result, we recommend creating template-based wizards instead, as they do not require Java language knowledge. For further info about how to write custom wizards please read the IDE Customization Guide.