Having it as a server side option is untennable, because the need for stealth and the need to be visible changes dynamically and server side options are fixed until relaunch of the server itself.
On my servers admins can choose to operate in stealth mode when they login, and this by far strikes me as the better solution.
For my servers it works because I can promote specific LFSW accounts, basically the driver logs in as a normal user and can type $promote to elevate themselves to admin status (dont bother trying, it checks LFSW name against a hard coded list
), after which then they can issue LFS commands with a $ prefix instead and they show up as an $admin.
For LFS Dedicated host you cannot check LFSW name, but I guess an alternative way to do this is
with a second admin password which, when used, allows the admin to operate in stealth mode.
Or a tick box on the login screen perhaps?