The forum can be used for any subject concerning OpenAlea.
Feel free to use it ! Go to the OpenAlea Forum .
There are also different mailing-lists associated to the project for important announcements:
For developers, you should subscribe to the SVN commits lists
Other discussions and news can be found in google+ OpenAlea community.
Feature requests or Support requests can be posted also on theGForge.
For more information, have a look to the document How to use collaborative tools.