Some earlier versions (1.13.0 to 1.16.0) of the Mediawiki software supported a configuration setting $wgActiveUserEditCount for the number of actions a users needed to perform within the specified time period ($wgActiveUserDays, typically 30 days) to be considered active. For some reason (performance problems?) this parameter was then removed, and now only 1 action is needed.

It could be useful for projects (that struggle to maintain a community and to recruit and welcome new contributors) to have easy access to the count of very active users, and such a count should be easy to implement. On top of the existing Special:ActiveUsers and magic word NUMBEROFACTIVEUSERS, a filter could be applied that removes those entries that fall below a threshold, which could be a run-time parameter, .e.g {{NUMBEROFACTIVEUSERS:5}} would yield the number of active users with at least 5 actions and Special:ActiveUsers?limit=100 would show a list of active users with at least 100 actions.