It's not mandatory, although it may integrate some forum features that are scheduled to be included in the Kunena integration plugin that is currently being worked on.
1. is it possible to have a tab in cb user profile which shows their latest comments on seyret videos (using kunena 1.0.9 as the commenting system in joomla 1.5.8)?
2. is it possible to link the username shown on a video comment to their cb profile?
1. Please upgrade to 1.2 Stable!
2. Integration plugin currently being worked on and should be coming soon... search for thread in stable area of forum.