Once we don't need the BetaFeatures integration (T322496), we should remove the config settings that we used to control the availability of each feature (reply tool, new topic tool etc.) on each wiki, to simplify future maintenance.
This applies to wgDiscussionTools_replytool, wgDiscussionTools_newtopictool, wgDiscussionTools_sourcemodetoolbar, wgDiscussionTools_topicsubscription, wgDiscussionTools_autotopicsub, wgDiscussionTools_visualenhancements.
With BetaFeatures out of the picture, the availability can be controlled more simply using wgHiddenPrefs.