Allow users to be added to many Groups when inserted by an Integrated Application

Example:

When having Confluence and Jira integrated with Crowd, when a new user is created using Confluence, it will be added to the confluence-users group only.

Would be great to be able to specify more groups to add the new user, so that they would be able to login in other integrated applications (like Jira). Having the user also added to jira-users would save the admin time.