[Xenon]

i don't know a hack, which would do all these things, but i have made something, on the same way.

all my secondary admins are supermods, i dont have any other supermods, so i made a copy of the admin folder named it supermod, and there i killed all files to which they shouldnt have access. then change the global.php to just allow supermods to go to this pages.

i also copied the user.php from the mod folder, so they have the same rights like other mods on the users.

its not realy hard to make such a hack for yourself, you just must know which scripts you'll allow your co-admins

but i don't think someone has released such a hack, because every admin wants to give his coadmins other privileges

hope this could help you