Maybe this is a corner case ... :)
We use the Jetty Maven plugin (jetty:run) to work on web projects. I can execute that goal from the Maven toolwindow with the current maven plugin but I think it would also be good to be able to run a goal under the debugger. That would allow people to debug while using plugins that actually do some run/execute action.
The Jetty plugin is not the only one, there are more plugins like that. They make development so much easier.