loxodon wrote:s it possible to have enabled only the registration approval? (and the posting approval disabled)
Yes, it is possible in the current version of the extension. You need to go to Administration->Start->Forums and there you can edit the settings for each forum. If "post approval" checbox is unchecked for a forum, all new posts in it will be added without approval. You can disable post approval for all your forums, but registration approval will be enabled.
Thanks, found it 
Btw, for next releases of this extension, maybe it would be good to have an option in settings to enable/disable post approval globally for new created forums (now its auto enable) or even for all forums, to enable/disable it with just one click. Just an idea, maybe its not so important 
Anyway its nice extension