You could do an exploded deployment: http://www.jboss.org/community/docs/DOC-9719. Then changes to static items and JSPs are picked up right away (might need a browser refresh).
You can also declare an external directory for deployment, and place your exploded war directory there. To do so, either:
a) edit the URLs attribute in the last MBean in the file server/xxx/conf/jboss-service.xml (works in 4.0.x and 4.2.x), or
b) Add a new value to the applicationURIs property of the SerializableDeploymentRepositoryFactory bean in server/xxx/conf/bootstrap/profile-repository.xml file (5.0)