User blog comment:DaNASCAT/Technical Update: February 24, 2015/@comment-452-20150225162943/@comment-126761-20150225171500

The short answer is no - a feature doesn't have to be in Labs to be tweaked further. However, we feel the the forum feature in general is popular and stable enough that it doesn't warrant continuing to live in Labs (especially when it's to be used on new wikias).