Still just GET and POST I think, because if you look here in the ESB source: http://anonsvn.jboss.org/repos/labs/labs/jbossesb/trunk/product/rosetta/src/org/jboss/soa/esb/actions/routing/http/
you can see the GET and POST handlers and the AbstractHttpMethodFactory class that they extend. So you can probably follow the pattern and add PUT and DELETE, but they're not there now.
I've implemented and seems to be okay, but the rest service has actions like GET that require a parameter sent in the url.
My question is, how I have to send the parameter? Because if I send it through the url, the server don't consume it.