Starting from version 2.2.4 which has been released today, the 
option "quick filter" has been added. A "quick filter" is a drop down box 
on the message display page. By selecting a value from the drop down box, 
only messages of that type are displayed. See this forum which uses "Quick 
filter = Date, Category".

This new option adresses a couple of installations which require a large 
number of logbooks. Instead of using many similar logbooks, the old logbook 
name can now be defined as an attribute. All messages get now mixed, but by 
defining the logbook attribute as a quick filter, one can display the 
messages belonging to the individual logbooks separately with a single 
click.