Requests for comment/Debugging at production server

Background
Debugging toolbar feature was introduced in MediaWiki 1.19.

Problem
Sometimes we have to debug on production wiki, but not want to show internal information to normal users.

But current architecture of debugging toolbar is available for everyone, so some internal information like server's directory structure, debug logs,, ... etc can be leaked.

Proposal
Make only selected user can use debugging toolbar. Current implementation is using user rights (usedebugtoolbar, see ).