There are two features that can be activated:
The site collection feature (Wiki Fields) - This adds extra columns to wiki libraries for optimal sorting when exporting to PDF
The site feature - This adds additional functions to all wiki libraries on a single site. To provide you with more flexibility on where you want to use these features, you can activate this for each individual workspace.
The site collection feature is optional and is not required for any other functionality (you can export without it, but it helps you structure your exports better). The site feature needs to be installed before you can use any of the BlueBridge Wiki Extensions.