First of all, thanks for your comments, Dave. As Carla has already replied to some of them, I'd like to supply information regarding your last topic: As with most association forms, it is actually possible to associate the same operator more than once with a specific image set, thus expressing more than one role. You simply have to check "Show associated?" in the upper part of the form, in order to include operators already assigned in the list of eligible persons (left pane), giving the possibility to associate the same person again with another (or even the same) role. I hope that solves your issue.