Just remember, the focus on this plugin it is not the complexity of features, but the ease on using it! :)
Grails AWS Plugin is using the Codehaus JIRA for handling issues.
If you found some bug or want to propose a new functionality, or anything related, send your questions on the Grails User Mailing List so people can help you out, or even fill a JIRA Issue here: http://jira.codehaus.org/browse/GRAILSPLUGINS under the component Grails-AWS