if you like the Envers project and would like to contribute to it - you're much more then welcome!
You can either look in JIRA for an unassigned issue (http://jira.jboss.org/jira/browse/ENVERS) or submit your own feature proposal (or bug report :) ) and start working on it.
You will be granted commit rights to "trunk" after submitting one (working) patch.
