1) First - why? Do you not trust your admin level staff? Admin in Gmod carries lots of access. If you're worried about admins seeing IP addresses of players that, as an admin, most people expect to help maintain a server, you aren't seeing a forrest surrounding the tree you are looking at.
1) Basic Gmod lua programming - we strongly encourage people to learn it here.
Really, this one is a fun one to learn from. Learning this one Gmod lua player function check might help you fix other items you've always wanted superadmin only (but, really, seriously, think about my #1 first)
Two files. I found one line logic statement with my experienced eyes in 10 seconds.
( Hint - Where, v or other variable letter is almost always the player being checked,
if v:IsAdmin() then ... )
You can have little programming knowledge at all and likely have figured out where to edit, perhaps not HOW to edit (Hint,
Player:IsSuperAdmin), but definitely where to edit.