When you use the sidebar then it happens quite often that the mailbox or newsgroup name is way too long to fit into the sidebar. Well, to overcome this problem, I developed a new option, shorten_hierarchy, to "shorten" or compress mailbox or newsgroup names when they're in hierarchies. An example would be the newsgroup name de.alt.sysadmin.recovery. When you enable the option, you will see this name as d.a.s.recovery instead in the sidebar. Again, see below for some screenshots.
Here you see how it looked before and also how it looks with shorten_hierarchy=no:

Here you see how it looks with shorten_hierarchy=yes:

Feedback is welcome!