roarpluginapplication executes roarpluginrunner in the application mode with it's own name as plugin name. This allows a plugin to be executed with like a application with it's own binary name (within $PATH).
For example with a plugin called "myapp" the package can provide a symlink from /usr/bin/myapp to roarpluginapplication. This will enable the user to start the plugin by just typing "myapp" at the command line.
For history information see RoarAudio(7).