As discussed in http://moodle.org/mod/forum/discuss.php?d=140966 trimming all content goes into the navigation blocks can cause some real usability issues.
We need to find a better solution to this, or at least a solution that will allow people to configure it as they want.

Options as I see them at the moment:
1/ Don't trim anything.
2/ Create a config setting to allow people to change the trim length to what they want.
3/ Set the trim length to a much higher value.
4/ Trim to X words instead of letters.

Personally I tossing up between options 2 and 4, closer to 4 to avoid more settings but perhaps it is worth a setting.
I'm open to any ideas that people have have here as well.