Make it possible to run the announcement goals only once for a multi-module project

If the pom.xml is containing some sub-modules, the goal changes:announcement-mail is trying to send it for each module, and fail because it could not find the template.
Announcement template C:\Dev\MyProject\SubmoduleA\target\announcement\announcement.vm not found...

Should be possible to configure the pom to send only the email for the root project.
Working with "mvn --non-recursive" option, but we need to be able to configure this behaviour into the pom.xml

The same issue for the changes:announcement-generate, but it's only a warning and the build can finish successfully.

Should include something like:
/**

• @parameter expression="$ {project}

  "
  **/
  private MavenProject mavenProject;

/**

• If true, will generate the changes only for the root module in case of project with sub-modules.
• @parameter expression="$ {plugin.aggregate}

  " default-value = "false"
  */
  private boolean aggregate;

public void execute() {
if (!mavenProject.isExecutionRoot() && aggregate)

..................
}