[Bacardi]

There are plugins, which include more option into this basic Admin Menu, so you should think again.
Do you want edit plugins because of that ?

adminmenu_custom.txt is... very limited. You can't do complex thing in there.


You can rename admin menu titles, from translation files.


*edit
With SourceMod Admin system, you can restrict admin commands to specific admin groups. This will hide commands (and whole category when no access to commands) from admin menu.