Page [[Special:ActiveUsers]] (e.g. https://en.wikipedia.org/wiki/Special:ActiveUsers) does not shows real number of active users, but just an inflated number. Actually, it shows ALL users which made at least ONE action within the last 30 days. What a wrong criterion for statistics.
If the user has made an edit in 30 days that does not mean he is an ”active user”!
A lot of users just correct some diacritics in pages, or just add a single comma/dot and therefore with a single edit in 30 days they are shown in list of Active Users. LOL. They are ”very active” ))

So, i suggest to change formula of calculations. List of active users must include only users which made at least 5 (or maybe 10) edits in last 30 days. This will be a more real number of users which really are active.
For wiktionaries and other smaller wikiprojects you can keep 1 action in 30 days as criterion.

If you do not want to implement this thing by default - you can add posibility of changing criterion by users themselves via URL manipulation.
I.e. http://en.wikipedia.org/w/index.php?title=Special:ActiveUsers&edits=20

Version: 1.24rc
Severity: enhancement