I don't think it's going to work. Infact i am not even sure whether it used to work with AS-4. If you are looking at using Embedded for AS-5, then there is a whole lot of activity going around this in a new project. You might want to watch the http://www.jboss.org/index.html?module=bb&op=viewforum&f=266 design forum and the jboss-dev discussion:

http://lists.jboss.org/pipermail/jboss-development/2009-June/014609.html