The Tiki developer mailing list is the closest we have to an "official" decision-making body for the Tiki development process.
To post to this list, send your message to:
(It is an image to reduce usage by spammers)
To be able to post to the list, you need to be a member, which you can do here: https://sourceforge.net/projects/tikiwiki/lists/tikiwiki-devel
Once you are a member, you will receive an email with more information.
Archives: https://sourceforge.net/p/tikiwiki/mailman/tikiwiki-devel/
There is also a web mirror using Forum and Mailing List Synchronization here: http://tiki.org/tiki-view_forum.php?forumId=26 (you need to be logged in)
The software powering the mailing list: https://list.org/
It is hosted by https://en.wikipedia.org/wiki/SourceForge
Related: