Facing exactly the same.
I've just started to learn the new JBoss 7, and my old startup parameter "-b hostname" is missing.
Also i tried to start JBoss 7 using eclipse + jboss tools, and tried setting the "host name" at eclipse UI, it does not too.
I cant see anything regarding this in the docs, are we missing some important info?
I dont know how correct is this, but i did: