Thinking about this: there could be a "super admin management page" (name and position to be decided) where all kinds of settings can be made by super administrators.

I don't like "prod/dev/testing" mode available by a GUI, prefer in files.

Another idea:

debug=1 : only show to super admin
debug=3 : OK for another admin
debug=4 : for all user
Or something like it (another setting ?)

It's more for tracevar : i update it each time to show it only to me.

Denis

I understand that this can be a wish to have this in the config.php file only.

Maybe we can have a setting there:

show_super_admin_controls_in_backend: yes; (default)

which any super admin can change to

show_super_admin_controls_in_backend: no;

when he wishes to.

Another solution :

1. Set a logfile
2. Allow to load/look log file at admin part