We'd need some "dev tool"here on the site to simplify the life (i.e. not have to use an admin account to see the error log for example). :P
Why would you want anyone to have access?
I think this would be an addon that would show certain development status or system health (like error log count, admin PM count) to members in a specific group, like those who have admin access. I don't use the admin account often, but be nice to get some notification that an action is needed or something so I know. Maybe there is a better way, or just add some additional info in the moderation/admin area for those that have extra access.