I am using JBoss AS 7.1.1 Brontes. I start it from eclipse.
I am managing the situation now in a very strange way.
Each time I have to do a change, i rename the existing JBoss, then I unpack JBoss into existing path and copy all the modules I need from old location, use the intended standalone-full.xml with new changes and then it works. But it is really cumbersome !