Right now, the work items lists (participants lists in workflows) are saved per user. I have a new use case for the saved participants lists: any user should be able to view all the saved participants list, not only the user who created them. Unfortunately, I couldn't find any way to customize this in a project, so the changes need to be done in the nuxeo ecm. The changes are small, however: there's a new NamedQuery that gets all the WorkItemsListEntry and a getter for it.
I've proposed the code for that in: http://code.nuxeo.com/cru/CR-85
Also, some tests should be updated/added.