When doing development of several independent applications over the JBoss AS, that JBoss AS installation get contaminated by those applications

If I create workspaces1, and inside it I create dynamic webproject 1, and run it on JBoss, then I switch to workspace2, and create dynamic webproject 2, and run it on JBoss, since it is the same JBoss instance, both dynamic webproject 1 and dynamic webproject 2 will start (and there is no way, from inside eclipse to undeploy dynamic webproject 1 unless I go back to workspaces1 and undeploy it.

But, if one is working with Tomcat, there is no problem, applications do not "contaminate" the shared Tomcat, why is that? well the Tomcat WTP Adapter has a configuration option enabled by default under "Server Location", that reads: "Use workspace metadata (does not modify Tomcat installation)". I would like to have an option like that for JBoss AS.