<quote who="Marc Delisle">
Can someone find a reason why the controluser should have rights to the "mysql" database, as we state in the doc?
As far as I can see, it is used to define which links shall be available in main.php3 (see line 177 in this file). It also gets the list of available DBs for that user in common.lib.php3 (line 778 onwards).
Or did I misunderstand your initial question?