org.eclipse.jst.server_adapters.ext.feature included in JBDS contains:
org.eclipse.jst.server.tomcat.core
org.eclipse.jst.server.tomcat.ui
org.eclipse.jst.server.websphere.core
org.eclipse.jst.server.generic.jboss
org.eclipse.jst.server.generic.jonas
org.eclipse.jst.server.generic.oc4j
To remove jboss generic server adapter feature should be excluded from JBDS Product feature and plugins listed above included in it as requirements without
org.eclipse.jst.server.generic.jboss