one suggestion to add support for numbers, if topic have number before name so for example 12 monkeys when you click on # to shows only titles with numbers like here http://www.prijevodi-online.org/serije/index/num
You can use this add-on https://brivium.com/resources/members-pagination-by-alphabetical.68/ for member lists.
Thanks for your answer but I am already using this addon. There is only a pagination on the tab "Notable Members", not on "registered members".