Option to exclude my own changes from the list. When monitoring, I'm primarily interested in other people's changes made to the area.
Option to set a begin date for the search. I'm usually interested in the most recent changes.
Option to list only changes made by a particular individual.
Option to display the history for changes for a particular item in a similar way as the ctrl-H (history) feature in JOSM directly in OWL or in a new browser window launched by OWL. This saves me the effort to go first to the changeset browser, then launch JOSM for the area shown in that browser, then .... etc.