MainDeployer MBean methods don't work in JBoss 5.0 CR1

I know that the deployment was reworked, but I don't know which impacts this had on the MainDeployer MBean. At least it seems to be quite non-functional

This is the state of the MainDeployer:
-operation "listDeployed" and others just return nothing
-"isDeployed (string)" works for a URL "file:/C:/temp/jboss-5.0.0.Beta4/server/default/deploy/KuchenZutatNM.ear", but not for "vfs:/C:/temp/jboss-5.0.0.Beta4/server/default/deploy/KuchenZutatNM.ear"
-"undeploy" and others don't work for any of the above URLs, both result in a console output "21:11:45,890 WARN [MainDeployer] undeploy 'file:/C:/temp/jboss-5.0.0.Beta4/server/default/deploy/KuchenZutatNM.ear' : package not deployed"

I created a small plugin for Eclipse WTP which tries to undeploy a module and waits for successful deployment of new modules, and this plugin does not work at all with JBoss 5. Probably I need to change it to use the new deployers, but I didn't find a hint to them.