But Kunena lacks support of user groups. After looking at its support forum, this seems to be the major complaint for some years now. The forum users are classified according to the quite-limited Joomla . I hope this choice can be re-considered someday.
Hell Fabricio, thanks for your feedback. Yes, Kunena uses the built-in Joomla user groups for the best integration possible. We believe this is a strength in comparison with other solutions.
Also, Kunena supports free third-party extensions like noixACL, JXtended Control, and the ArtofUser component which offer fine-grained user control, including group features, in Kunena. These are great solutions and, in our opinion, are better than the options available in other forums.
Kunena 1.6.4 (to be released very shortly) will support Joomla 1.6 and that includes the native groups (which are more flexible). Kunena 2.0 will also have increased group support (due out in beta soon). So check back to see if either of those versions (or the above free group options) meet your needs.