01189: no skin should need editing config.php
Description: for a wiki farm, only the owner have access to any file on the server. including config.php
thus, there's no way a wiki owner (part of wiki farm) can have access to the file.
so, all skin configuration should be on the wiki itself. including any css change should be done in the wiki itself. maybe somewhere like SiteAdmin.SkinConfig ; SiteAdmin.SkinCSS ; etc... so each wiki can have different skin settings without need to edit any files they do not have access to.