Just do:
<property name="excludedContexts">ROOT,admin-console,invoker,jbossws,jmx-console,juddi,web-console</property>

and see:
[Thu Sep 01 10:12:07 2011] [debug] mod_manager.c(2296): manager_handler ENABLE-APP processing: "JVMRoute=4e6189af-0502-3305-8ff3-fad7fee8b516&Alias=localhost&Context=%2F"