JBoss doesn't like exploded directories

I have installed the JBoss plugin and have tried with both JBoss 5.0.0.Beta2 and jboss-4.2.0.GA. When I deploy a web module that is set up as an exploded directory I get an error in the Run/Debug Configurations screen that reads:

Run Configuration Error: Deployment source for module 'kuali' has no valid extension.

I assume it's because I'm not deploying from a .war or .ear file.

What should I do to resolve this?