Feature summary (what you would like to be able to do and where):
Requested on the checkuser IRC channel.
Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
- loginwiki only stores account creations, so CheckUserHelper is not useful in most cases
A simple config should be an easy fix as it would be configurable per-wiki and a few lines of code.