Piwik has the config setting action_title_category_delimiter, which can be used to change the delimiter by which page titles are split for the hierarchical page title report.

The log importer (import_logs.py) uses the page title for errors and redirects, e.g. a 404 error is tracked with the title "404/URL = .../From = ...". The slashes are hardcoded, which is not optimal when the action_title_category_delimiter config option is used in Piwik, since the title won't be split in this case. Therefore, a new parameter --title-category-delimiter is added to the log importer.