The exceptions mechanism does not work at all Rated 1 out of 5 stars

even not the default exceptions.
Unfortunately the author does not reply on support emails.

This review is for a previous version of the add-on (2.0.3). 

Exceptions work as designed

I believe you are misunderstanding what Exceptions are. When in the Exceptions tab, click the Help button for details. (I'm prepared to admit that "Exceptions" isn't a terribly good name for the actual feature. Happy to receive suggestions.)