Make the jcr observers in the HST first flush events non synchronized to a queue and dispatch these events in turn (possibly to synchronized methods)

By default, all Hippo repository observers are synchronous. When listening to events, and make this listening synchronized in the client (= HST in this case) code, easily deadlocks are met in, it seems, clustered setups.

Hence, I'd like to delegate the events to a temporal hst queue, which in turn delegates them in a different thread to listeners.