User blog comment:DaNASCAT/Technical Update: September 26, 2016/@comment-452-20160927111449/@comment-126761-20160927112829

While we try to avoid breaking customizations, they are ultimately not officially supported. The update has some fairly significant structural changes which do mean personal code will need some tweaks - but then they should be able to work like before.

Regarding interactions - there are benefits and disadvantages to both hover and click interactions, but using clicks means no accidental popups and allows consistent behaviour across the whole bar.