Somewhere between admin and super admin

Anyone know of a plugin that provides a role somewhere between 'admin' and 'super admin'? I want to give our support staff access to administer all sites without giving them access to change network settings. I suppose I could just write a plugin that adds them as an admin to each site that's created, but it'd be nice to give 'em access to some of the Network Admin tools (searching for sites, maybe adding sites/users/etc) without letting them change plugin settings or other network-wide options.

Any ideas?