When an event is being bookmarked (put in the url) it makes the url a bit ugly or long.
Since that isn't actually necessary for the "default" event the first event shouldn't be bookmarked.
For the tasks page this is done in task-filters.js row 136:
this.fireEvent(Activiti.event.selectTaskFilter, filter, e, e != null);
..where the last parameter then becomes false.
A sweep across the whole app (including cycle) where the DataTable pr DataList are being used would be ideal.