If any of the afore mentioned packaging modes does not suite your needs you may use the Installer plugin to craft a better packaging option. This plugin supports the following additional modes:

You may call any of these modes as you would with the standard ones when the installer plugin is available, in other words

griffon package izpack

Many of these modes support additional configuration before generating the final package. It is a good idea to follow a two-step process

griffon prepare-izpack
// edit target/installer/izpack/resources/installer.xml
// and/or add more files to that directory
griffon create-izpack

Each additional packaging mode triggers 4 events with their type as the single event parameter: PreparePackageStart, PreparePackageEnd, CreatePackageStart and CreatePackageEnd.