Hi,
I can go along woith adding the administration class to eletter and DesignTools pages.
I don't really see MemberList or ProfileView as administration pages, we link to memberlist from the admin section for convenience but memberlist and profileview are also avilable to non administrators. They already have classes "memberlist" and "profileview" so if you want to style them the same as pages with the administration class you can just do:
.memberlist, .profileview, .administration{ }
I'll add breadcrumbs to ManageUsers and I'll add a crumb to Administration on the memberlist page but only show it if the user viewing the page is an administrator.
Best,
Joe